Selim I's expedition against the Mamluks during 1516-1518 resulted in the extinction of the Mamluk Empire and the establishment of the Ottoman Empire as an Islamic universal empire. This event left enormous effects on the history of the Middle East. However there are rather few studies on this subject.As for the early condition of the ancient Mamluk lands under Ottoman rule, a document which is preserved in the Topikapi Sarayi Archive and numbered D 9772 is one of the most important source materials.It is a list of the livas (sancaks) and sancakbeyis of the Ottoman Empire. Prof. Omer Lutfi Barkan published it and dated it Sevval 927 H—Receb 928 H. Though, according to Prof. Miroglu, Dr. Dundar Aydin re-dated it A. D. 1517 in his dessertation in 1972, most of Ottomanists have been still accecpting Prof. Barkan's conclusion.Here I tried to date the document D 9772 more exactly. My conclusion is that it reflects the location of sancaks and sancakbeyis just after the large scale appointments on 26th Ramazan 923 H. With this new fact, I will try to re-examine the process of Selim's attempts to reorganize the ancient Mamluk lands under the new Ottoman system in this article.