Built between 1427 and 1483, it is the oldest surviving purpose-built building for university use, specifically for lectures, oral exams and discussions on theology.
The ceiling consists of very elaborate lierne vaulting with bosses (455 of them), designed by William Orchard in the 1480s.
The building is physically attached to the Bodleian Library (with Duke Humfrey's Library on the first floor above it), and is opposite the Sheldonian Theatre where students matriculate and graduate.
At the far end from the Bodleian Library entrance, a door leads to Convocation House (built 1634–7).
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