Varied  are  endowments installations of public interest, and was inciting share of the mosques. we will try here to study and endowment back to the era of Abu Hassan Ali Almareni (692 AH / 1292 AD - 752 AH / 1330 AD), have written Endowment on the stone which is found inside a mosque al obbad  or mosque of Sidi boumediene inof Tlemcen 's city, Algeria. And reits Thabays content School students of science, land and fields, orchards and trees, three houses and Doarh, four millstone houses, two bathrooms, an Egyptian, and courts. The endowment named several people whom lands are bought, also mentioned  several places, still mostly unknown until now inTlemcen.