Standing in the center of the chapel and looking upward, you see eight walls of alternating light and dark stone rising around you, tier upon tier of round arches stacked one above another before closing into an eight-sided dome covered in gold mosaic. Suspended in that open space hangs a great wheel chandelier of gilded bronze, floating like a crown. From the east, light pours through a soaring choir hall whose walls are almost entirely stained glass, joined directly to the ancient octagon so that a visitor stepping inside feels poised between two eras separated by six hundred years.
This is Aachen Cathedral, known in German as the Aachener Dom or Hoher Dom zu Aachen, in the city of Aachen near the borders of Belgium and the Netherlands. Its core is the Palatine Chapel (Pfalzkapelle), which Charlemagne (Karl der Große) built as his palace chapel and where he was buried in 814. For Catholics, what has made this church a major place of pilgrimage for nearly seven centuries is the presence of the four great relics associated with the Virgin Mary, Jesus Christ, and Saint John the Baptist.
ISt. Mary's Church and the Four Great Relics
The Aachener Dom is the cathedral of the Diocese of Aachen, housing the bishop's cathedra, and from its earliest days it has been dedicated to the Virgin Mary. The cathedral's official website refers to it as St. Mary's Church (Marienkirche). The word Palatine comes from the Latin palatium, meaning palace: this church originally served as the chapel of Charlemagne's palace complex and only later became the cathedral of a diocese.
The four great relics kept inside the Shrine of St. Mary are: the cloak of the Virgin Mary, the swaddling clothes of the Infant Jesus, the loincloth worn by Jesus Christ on the cross, and the cloth on which the head of Saint John the Baptist was laid. In Catholic practice, relics are venerated as tangible reminders of the persons and events of the Gospel that direct the heart toward God, not as objects worshiped in themselves. The Church does not require the faithful to believe in the historical authenticity of any particular relic as an article of faith.
According to the cathedral's official website, the four relics are taken out of the shrine for veneration by the faithful only during the Aachen Pilgrimage (Heiligtumsfahrt), a ten-day observance held every seven years since 1349. The Shrine of St. Mary (Marienschrein) was completed around 1238 or 1239. Also in the choir stands the Shrine of Charlemagne (Karlsschrein), completed in 1215, which holds the bones of the chapel's founder. The UNESCO file also notes the Roman marble Proserpina sarcophagus that once held his body and is now displayed in the cathedral treasury.
Not far to the east stands Cologne Cathedral (Kölner Dom), which houses the Shrine of the Three Kings and is covered by the library in Cologne Cathedral.
IIFrom Palace Chapel to Cathedral
Aachen has been known for its thermal springs since Roman times, and the chapel was erected directly over the remains of an earlier Roman bath complex, according to the cathedral's website. Its architect was Odo of Metz, who drew inspiration from the sixth-century octagonal church of San Vitale in Ravenna, Italy. Across the centuries, a Gothic choir hall and a ring of side chapels grew up around the octagon, yet the Carolingian core has survived nearly intact.
- Around 793 to 813Construction of the Palatine ChapelUNESCO and Britannica date the chapel to around 793 to 813, while UNESCO also notes construction beginning around 790 to 800. Sacred Destinations gives 786 as the start date. See the historical note below.
- 805ConsecrationThe chapel was consecrated in 805 according to Sacred Destinations. Among the reference sources consulted by the library, this date appears only in that source.
- 814Burial of CharlemagneThe ruler who commissioned the chapel died on 28 January 814 and was buried here.
- 1165 to 1184The Barbarossa ChandelierA gilded bronze wheel chandelier measuring 4.2 meters in diameter and holding 48 candles was crafted and hung beneath the octagonal dome at the order of Emperor Frederick I Barbarossa and Empress Beatrix.
- 1215 and 1238The two great shrinesThe Shrine of Charlemagne was completed in 1215, and the Shrine of St. Mary housing the four great relics was completed in 1238 according to Sacred Destinations (around 1239 according to the cathedral website).
- 1349Seven-year pilgrimage establishedThe custom of displaying the four great relics for public veneration once every seven years began in this year, according to the cathedral's website.
- 1355 to 1414Building and consecration of the Gothic choir hallThe new Gothic choir hall was begun in 1355 and consecrated in 1414, earning the name Glass House for its more than 1,000 square meters of stained glass. According to Sacred Destinations, the fourteen statues on its pillars were completed before 1420.
- 1978UNESCO World Heritage SiteInscribed as Germany's first World Heritage site under criteria i, ii, iv, and vi, with a minor boundary modification in 2013.
The main point where reference sources differ is the starting date of construction. The UNESCO file states that construction began around 790 to 800 and elsewhere notes that the chapel was built between 793 and 813. Britannica likewise gives 793 to 813. Sacred Destinations gives a start date of 786 and a consecration in 805. This range reflects the absence of a surviving foundation charter, leaving scholars to deduce the timeline from archaeological layers and dendrochronology of the timber foundations. The library uses the general phrasing late eighth to early ninth century where a single date is not required.
The cathedral's official website records more than 1.3 million visitors per year, with roughly 1.25 million in 2025. The 2023 pilgrimage had originally been scheduled for 2021 before being postponed, and according to the German-language Catholic News Agency (CNA Deutsch), the next Aachen Pilgrimage is set for 17 to 25 June 2028 in order to return to the original seven-year rhythm.
IIIThe Carolingian Octagon and the Gothic Glass House
The Aachener Dom is regarded as the best-preserved architectural monument of the Carolingian era. Its core is a domed octagon with an interior span of about 14.4 meters, encircled by a two-story sixteen-sided ambulatory with an overall diameter of roughly 30 meters. The crown of the octagonal dome rises about 31.4 meters above the floor (Sacred Destinations rounds this to about 31 meters). The arches are laid in alternating light and dark stone voussoirs, and the upper gallery features antique columns that, according to Sacred Destinations, were brought from Rome and Ravenna. The cathedral's website notes that when completed, the building surpassed every church north of the Alps at the time.
Six centuries later, the citizens of Aachen added a Gothic choir hall to the east, begun in 1355 and consecrated in 1414, whose walls were reduced almost entirely to stone tracery holding more than 1,000 square meters of stained-glass windows rising 25.5 meters high beneath a 32-meter vault (Sacred Destinations gives a rounded window height of about 100 feet, or 30 meters). It became known as the Aachen Glass House (Glashaus). Both the Shrine of St. Mary and the Shrine of Charlemagne stand inside this choir hall.
Set in the western gallery of the octagon and assembled from Carolingian marble slabs. From 936 to 1531 it served as the coronation throne of the German kings.
Made around 1165 to 1184, measuring 4.2 meters in diameter with 48 candles and 16 miniature towers, suspended beneath the dome. The ring represents the heavenly Jerusalem described in the Book of Revelation.
A pair of cast bronze doors at the western entrance dating from around 800 and weighing about four tons according to Sacred Destinations, among the largest surviving single-piece bronze castings of the Carolingian period.
The golden altar frontal composed of 17 repoussé gold panels made around 1000, and the gilded pulpit studded with ivory plaques donated by Emperor Henry II (made around 1002 to 1014 per the cathedral website, or around 1020 per Sacred Destinations), both located in the sanctuary.
Described by UNESCO as one of the most important church treasuries in northern Europe, housing the Cross of Lothair from around 1000 and the silver-gilt Bust of Charlemagne reliquary (Karlsbüste, made around 1349).
| Feature | Measurement or Figure | Source |
|---|---|---|
| Diameter of octagon and outer ambulatory | Approx. 14.4 m (inner core) and 30 m (overall ring) | aachenerdom.de, compiled reference data |
| Height of the octagonal dome vault | Approx. 31.4 m (or 31 m) | aachenerdom.de, Sacred Destinations |
| Diameter of the Barbarossa Chandelier | 4.2 m (48 candles) | aachenerdom.de, Sacred Destinations |
| Gothic Glass House choir hall | 32 m vault height, 25.5 m windows (or approx. 100 ft), over 1,000 m² of glass | aachenerdom.de, Sacred Destinations |
| Annual visitors | Over 1.3 million | aachenerdom.de, approx. 1.25 million in 2025 |
Vietnamese readers who hear the phrase royal throne often picture a gilded chair carved with dragons. The throne at Aachen is the exact opposite: nothing more than plain slabs of white marble joined with bronze clamps, devoid of carved ornament and set atop a stone base approached by six steps. That austere form was kept unchanged throughout nearly six centuries of royal coronations. The library refers to it as the marble throne to avoid any misconception.
IVLandform and Orientation
A clear caveat is needed at the outset: Catholicism does not teach feng shui, and Odo of Metz did not site the chapel by geomantic rules. The chapel follows liturgical orientation: the altar stands in the east, the Gothic choir hall later extended that axis farther eastward, and the entrance tower block stands in the west. The octagonal plan carries its own meaning within Christian tradition: the number eight represents the eighth day, the day of Christ's resurrection and the dawn of the new creation. The observations below represent a comparative reading through traditional Vietnamese geomancy offered for readers familiar with that framework, not anything recorded in the cathedral's own sources.
A Vietnamese visitor looking at an octagonal building will immediately think of the Eight Trigrams (Bát Quái) corresponding to the eight directions. Caution is warranted here: the eight-sided form at Aachen comes from the Christian symbolism of the eighth day and the model of San Vitale in Ravenna, with no connection to the Book of Changes. Even so, both traditions see in the number eight an image of completeness, and an eight-sided core wrapped in a sixteen-sided ambulatory receives light and air evenly from all eight directions.
The most notable feature is the water vein. Aachen sits in a basin rimmed by border hills and blessed with natural thermal springs, where the Romans built their bath complex of Aquae Granni, and the chapel stands directly over those Roman baths. Traditional East Asian geomancy views underground water veins as the vital currents of the earth, and hot springs as places where yang energy rises from deep underground. In that traditional reading, a sanctuary built over such a spring rests on living ground.
A third feature is the layering of generations on a single site. Roman foundations, then the Carolingian chapel, then the Gothic choir, then the ring of later chapels: each era built upon the preceding one without erasing it. Traditional Vietnamese geomancy calls a plot chosen by many successive generations for sacred work land with enduring affinity, much like village communal houses and pagodas in Vietnam rebuilt repeatedly on the same ancient foundation.
Finally, there is the bright hall (minh đường). The cathedral stands in the dense medieval center, hemmed in by surrounding buildings, with the small Domhof courtyard to the west and the town hall square and Lousberg hill to the north. By traditional geomantic standards, the outer approach is narrow. Yet the octagon creates an inner bright hall of its own: a vertical space rising more than thirty-one meters beneath the dome where every line of sight converges at the center. The library notes this as a comparative observation, not an intention of the builders.
VThe Seven-Year Pilgrimage and Liturgical Feasts
The cathedral follows the general liturgical calendar of the Catholic Church on the Gregorian calendar. Its greatest observance takes place not annually but once every seven years: the Aachen Pilgrimage, when the four great relics are brought out from the Shrine of St. Mary. Only dates are listed here, without service times.
| Date | Calendar | Observance | Description |
|---|---|---|---|
| About ten days, once every seven years | Gregorian calendar, the cathedral's own cycle | Aachen Pilgrimage (Heiligtumsfahrt) | The four great relics are displayed for veneration by pilgrims. Recent pilgrimages took place in 2014 and 2023, with the next scheduled from 17 to 25 June 2028. |
| 15 August | Catholic liturgical calendar, Gregorian | Solemnity of the Assumption of the Blessed Virgin Mary | One of the principal Marian feasts of the year, celebrated solemnly in this cathedral dedicated to the Virgin Mary. |
| 25 December | Catholic liturgical calendar, Gregorian | Christmas | Celebration of the Nativity of Jesus Christ, closely connected with the relic of the swaddling clothes of the Infant Jesus kept here. |
| Holy Week and Easter | Catholic liturgical calendar, movable date | Culmination of the liturgical year | The Bishop of Aachen presides over the principal liturgies in the cathedral for the diocese. |
| 24 June | Catholic liturgical calendar, Gregorian | Nativity of Saint John the Baptist | Feast of the saint whose beheading cloth is preserved among the four relics in the Shrine of St. Mary. |
The Diocese of Aachen groups the Aachen Pilgrimage within a shared Rhine-Meuse tradition of seven-year relic pilgrimages alongside Kornelimünster, Mönchengladbach, and Maastricht. The Diocese of Aachen has twice sent an official diocesan pilgrimage to take part in the relic procession of Saint Servatius at the Basilica of Saint Servatius, Maastricht, in 2018 and on 15 June 2025, according to the diocese's website.
VILocation And How To Get There
- Address
- Domhof, 52062 Aachen (văn phòng nhà thờ: Klosterplatz 2, 52062 Aachen)
- Getting there
- The cathedral stands in the middle of Aachen's old town, with the visitor entrance on the Domhof courtyard a few steps from the town hall square. From Aachen Hauptbahnhof (the main railway station), it is about a fifteen-minute walk north.
- Coordinates
- 50.7747, 6.0839
This is a working cathedral where daily liturgy is celebrated, so the customs of a house of worship apply: dress modestly, remove hats, keep silence inside the church, and do not walk around during Mass. The upper gallery with the marble throne and the Gothic choir hall can be entered only on a guided tour led by cathedral staff. The Cathedral Treasury (Domschatzkammer) is housed in a separate building on Johannes-Paul-II.-Straße connected to the cloister on the north side of the cathedral.
Nearby places in the library
VIIContribute To This Page
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?Quick Questions
When was Aachen Cathedral built
Its core is the Palatine Chapel, built in the late eighth and early ninth centuries. UNESCO and Britannica date it to around 793 to 813, with UNESCO also noting construction beginning around 790 to 800, while Sacred Destinations gives a start date of 786 and consecration in 805. The Gothic choir hall was begun in 1355 and consecrated in 1414.
Where is Charlemagne buried
Charlemagne was buried in the Palatine Chapel, now Aachen Cathedral, in 814. His bones are preserved in the Shrine of Charlemagne completed in 1215 and placed in the Gothic choir hall. The Roman marble Proserpina sarcophagus that originally held his body and the 1349 silver-gilt Bust of Charlemagne reliquary are displayed in the cathedral treasury.
What are the four great relics of Aachen
They are the cloak of the Virgin Mary, the swaddling clothes of the Infant Jesus, the loincloth worn by Jesus Christ on the cross, and the cloth on which the head of Saint John the Baptist was laid. Kept inside the Shrine of St. Mary completed around 1238 or 1239, they are displayed only once every seven years during the Aachen Pilgrimage.
When is the next Aachen Pilgrimage
According to the German-language Catholic News Agency (CNA Deutsch), the next Aachen Pilgrimage (Heiligtumsfahrt) will take place from 17 to 25 June 2028. The previous pilgrimage in 2023 had been postponed from 2021, and the 2028 date returns to the seven-year cycle observed since 1349.
Why is Aachen Cathedral octagonal
Its architect, Odo of Metz, modeled the building on the sixth-century octagonal church of San Vitale in Ravenna, Italy. In Christian tradition, the number eight represents the eighth day, the day of Christ's resurrection and the beginning of the new creation, so eight-sided plans were often chosen for chapels and baptisteries.