Westwork
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A westwork (also westwerk) is the monumental, west-facing entrance section of a Carolingian, Ottonian, or Romanesque church. The exterior consists of multiple stories between two towers. The interior includes an entrance vestibule, a chapel, and a series of galleries overlooking the nave. This was used to show imperial rule.
The technique of the westwork first originated in the ancient churches of Syria.
The westwork of the Corvey Abbey (873-885) is a well conserved example.