This study analyses the original waqf documents belonging to Qijmās al-Isḥāqī, an amir who lived in late Mamluk Egypt and Syria, from three perspectives: first, the types of assets possessed or endowed by Qijmās and the creation of these assets; second, the contexts and purposes of establishing waqfs by comparing the data obtained from the documents and the life history of Qijmās, which was reconstructed from literary sources; and third, how his personal relationships reflected the character of his waqfs. Further, this study reveals how he selectively and strategically used the waqf system for personal and/or public benefit at different stages of his life and according to the prevalent social circumstances. This case study proves that the waqf system had multi-dimensional and complex functions: in addition to realizing its universal purpose of enabling the performance of charitable deeds, the waqf system fulfilled the founder's particularistic secular intentions and expectations.