Sackler Library Project, Oxford. Archaeological Evaluation Report.

Evaluation on the site of the proposed Sackler Library development, behind Beaumont and St John Street, revealed the damaged remains of a number of substantial faced limestone walls over 1m thick, and datable before the 14th century. These were associated with numerous fragments of high-quality window glass painted with heraldic devices, along with white roof and green-glazed ridge-tiles, and worn slip-decorated floor tiles. All this evidence indicates the presence of a secular building of the highest status, and dating to 12-14th centuries. There seem little doubt, therefore, that the remains are those of the Beaumont Palace within whose precinct the site lies.