 The hall has been said to be " among the most impressive of all the Oxford college halls " , with its " fine panelling , austere ceiling , and its notable paintings " . Like the chapel , it was largely built by Griffith Powell between 1613 and 1620 , and was finally completed soon after his death in 1620 . Pevsner noted the " elaborately decorated columns " of the screen ( installed in 1634 ) and the dragons along the frieze , and said that it was one of the earliest examples in Oxford of panelling using four " L " shapes around a centre . In 1741 and 1742 , the oak @-@ beamed roof was covered with plaster to make rooms in the roof space . Pevsner described the 1741 cartouche on the north wall , which contains the college crest , as " large [ and ] rich " . The hall contains a portrait of Elizabeth I , as well as portraits of former principals and benefactors . There are also portraits by court artists of two other monarchs who were college benefactors : Charles I ( by Anthony van Dyck ) and Charles II ( by Sir Peter Lely ) . 
