In brief
The monastery ensemble shows successive architectural periods.
Useful to know
The Benedictine community in Pannonhalma was founded in 996. UNESCO specifies that the earliest preserved monastery buildings are from 1224, and the ensemble collects successive styles. [1]
This is an important difference in describing a millennial place: the institution may be older than the visible architecture. On a plan, look for how the different parts connect, rather than expecting simultaneous construction. Prolonged use adds rooms and converts old ones. Historical continuity is seen precisely in these changes, not in the statement that everything is left over from the founding.
Sources
For further detail and to check the information: