This article presents the edition and translation of five unpublished notarial deeds that describe the purchase of lands for the benefit of the Maronite Patriarchate in the 9th/15th century. They attest the recognition of this ecclesiastical institution by the Mamluk authorities, so that its representatives could conclude transactions on its behalf, before the deputy of the shāfi‘ī qadi. The Patriarchate respects and uses the Islamic legal and notarial doctrine which regulates commercial practices between dhimmī-s but also between Muslims and non-Muslims. These documents provide, in addition, information on the status and nature of lands in this area, and on the amount of kharāj. The fifth deed, drawn up by a Christian notarial authority, reflects the autonomy of dhimmī institutions under the Mamluks; its reproduction and preservation also highlight the need of the Patriarchate to provide proof of ownership of its immovable property at any time.