The Dervish lodge of Osman Baba founded in the first quarter of the XV th century and the Dervish convent of Otman Baba established in the last quarter of the same century are mixed with each order each other. In this article we determine that the founders of these two important Bektashi convents in the Balkans are two different people. Using Ottoman survey registers dated between 1515-1573 we study the evolution of these two lodges. With the localization enterprise we try to determine the place of the convent of Otman Baba which is different from Osman Baba lodge.