This book was first published in Turkish under the title Bilinmeyen Osmanli, co-authored by Prof. Dr. Said Öztürk, and 250,000 copies were printed. I answered 290 questions whereas Öztürk answered 13 in total. He collaborated regarding source details and references as well as tirelessly proofreading and editing the book. In addition, this book was later translated into Arabic; the first edition was published by Osmanli Arastirmalari Vakfi (OSAV), Istanbul, and the second will be published...