[3] In a charter of Henry de Lacy, 4th Baron of Pontefract, son of Robert, the church is spoken of as dedicated to St. Mary and St. John.
These donations were finally confirmed to the monastery by a Bull of Pope Celestine (whether II or III is uncertain), which also conferred certain ecclesiastical privileges on the priory.
At the latter date a prior of exceptional ability was in charge of the house, and he is commended for his zeal during the twelve years of his rule, which had resulted in a reduction of the monastery's debts from 3200 marks to 350.
In the previous year (1322) Thomas, Earl of Lancaster had been beheaded at Pontefract, and his body buried in the priory church "on the right hand of the high altar".
[5] However, not long after, a chantry dedicated to St. Thomas was built on the site of the execution and, in 1343, license was given to the prior and Convent of Pontefract "to allow Masses and other Divine Services" to be celebrated there.