De Prefetti's need to generate income for the Crusader Church and restore the financial fortunes of his see had been occasioned by two misfortunes: his bishopric had suffered significant losses following the destructive conquest of Bethlehem by the Khwarazmian Turks in 1244, and his immediate predecessor had further impoverished his cathedral chapter through the alienation of a considerable amount of its property. The priory, obedient to the Church of Bethlehem, would also house the poor and, if they visited, provide hospitality to the bishop, canons and brothers of Bethlehem. Thus, Bethlem became a "hospital", in medieval usage, "an institution supported by charity or taxes for the care of the needy". The subordination of the priory's religious order to the bishops of Bethlehem was further underlined in the foundational charter, which stipulated that the prior, canons and inmates were to wear a star upon their cloaks and capes to symbolise their obedience to the church of Bethlehem.