Originally founded as a house for Premonstratensian canons around 1175, by Agnes, widow of Herbert de Orreby, the priory was a dependency of Welbeck Abbey and named in honour of Saint Thomas the Martyr.
It achieved its independence and abbey status in 1250, and appears from surviving records to have been well run. It was suppressed in 1536, its last abbot being Edmund Toft. It is an ancient scheduled monument.
- "Houses of Premonstratensian canons". Hagnaby. Victoria County History. Retrieved 24 May 2011.
- Historic England. "Hagnaby Abbey (355674)". PastScape. Retrieved 24 May 2011.
- "Hagnaby Abbey: a Premonstratensian Abbey and a Post-Medieval House and Formal Garden". Ancient Monuments. Ancientmonuments.info. Retrieved 24 May 2011.
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