sentences:  Mowbray was slain by the Turks near Constantinople while en route to the Holy Land.A letter from the priory of 'Peyn' written in 1396 suggests that he was initially buried at the convent at Pera, opposite Constantinople; according to the letter, 'at the instance of his son Thomas', his bones had been gathered and were sent to England for burial with his ancestors.His will was proved at Lincoln on 17 May 1369.