This encaustic tile with an eagle on the diagonal came from the church of Saint Ethelreda at West Quantoxhead, Somerset.
From Saint Etheldreda's Church, West Quantoxhead, England; [ Sam Fogg Ltd., London (sold 2015)]
Mellor, Maureen. Pots and Tiles of the Middle Ages. London: Sam Fogg Ltd., 2014. no. 25c, pp. 74–75.
The Metropolitan Museum of Art. "One Hundred Forty-Fifth Annual Report of the Trustees for the Fiscal Year July 1, 2014 through June 30, 2015." Annual Report of the Trustees of the Metropolitan Museum of Art 145 (2015). p. 54.