Archiabbatia or Abbatia Territorialis Sancti Martini in Monte Pannoniae) is a medieval building in Pannonhalma and is one of the oldest historical monuments in Hungary.

Its sights include the Basilica with the Crypt (built in the 13th century), the Cloisters, the monumental Library with 360,000 volumes, the Baroque Refectory (with several examples of trompe-l'œil) and the Archabbey Collection (the second biggest in the country).

The oldest surviving document to use the Hungarian language, the Charter of the Tihany Benedictine Abbey, dating back to 1055, is still preserved in the library.

During one and a half centuries of the occupation of Hungary by the Ottoman Empire, the monks had to abandon the abbey for varying amounts of time.

The state and the monarchs judged the operation of the communities according to immediate utility, by and large tolerating only those orders which practised nursing and education.

In July 2011, the heart of former Crown Prince of Austria and Hungary Otto von Habsburg was buried in Pannonhalma Archabbey.

[2] The present church of Pannonhalma, a crowning achievement of the early Gothic style, was built at the beginning of the 13th century during the reign of Abbot Uros, and was consecrated most likely in 1224.

The church was extended during the reign of King Matthias, in which the present-day ceiling of the sanctuary, the eastern ends of the aisles and the Saint Benedict chapel were completed.

At this time the main altar, the pulpit, the frescoes of the ceiling, and the upper-level stained glass window depicting Saint Martin were added.

On the four sides of the oval hall's ceiling the allegories of the four medieval university faculties can be seen: Law, Theology, Medicine and the Arts.

In the 18th century Archabbot Benedek Sajghó (1722–1768) had the Carmelite brother Atanáz Márton Witwer design the baroque elements of the monastery.

The six well-known Biblical scenes on the side-walls are thematically connected to eating: the offering of vinegar to Christ on the Cross; the temptation of Jesus in the desert; Daniel in the lions' lair; the feast of King Balthasar; the decapitation of Saint John, the Baptist; and a scene from the life of Saint Benedict.

The edifice was originally covered by a 26-metre high, double-shell dome with a colossal brass relief on it representing the Hungarian royal crown.

Two windows shed light on the interior, a circular, undivided room covered by a low dome (i.e. the original inner shell).

The unfinished fresco decorating the eastern wall is an allegorical vision of the Foundation of the Hungarian state and was painted by Vilmos Aba-Novák in 1938.

The chapel, with its three baroque altars and small, 18th-century organ, was renovated in 1865, at which time the romantic ornamentation of the walls and the portal took place.

The Pannonhalma Archives of the Benedictine Archabbey contains one of the richest and most valuable collections of documents from the first centuries of Hungarian statehood.

Social and political turmoil following World War II made it impossible to continue the centuries-old traditions, since both the properties and the winery were taken over by the Communist state.

The main grape varieties are Rhine Riesling, Sauvignon blanc, Gewürztraminer, Welschriesling, Ezerjó and Sárfehér.