This book is a collection of articles by Géza Dávid about the demographic and administrative history of Hungary under the Ottoman rule. In the early 16th century when the Ottomans took control of the territories of what is modern Hungary today, the area went through a process of dramatic changes lasting roughly two centuries. A new administrative organization, depopulation of villages, mass migrations and changing patterns of settlements were some of the imprints of these changes. Ottoman official documents are one of the best evidences that give an indication of the demographic and administrative transformations that took place in the area under the Ottoman rule. The writer refers to the Ottoman official documents to discuss this neglected era of the Hungarian history.