 Complete the following phrase:  Among these sources are: Destan-ı Tevarih-i Al-i Osman the oral history of the Ottomans, written in the 14th century by the Ottoman poet and court physician better known as Ahmedî 1334-1413 CE,  the joy of histories by Şükrullah d. 1464 CE, and  history of the Ottomans by Derviş Ahmed Âşıkî, known as Âşıkpaşazâde 14001484 CE. Additionally, these remaining sources are not the originals, but rather copies, or copies of the copies that were rewritten over the years, leading to a probable loss or altering in the information. In fact, it is accepted that Ottoman, European, and Byzantine sources are not very reliable when considering the origins of Osman and his clan. On one hand, the oldest known records originally written by the Ottomans all date back to the period that followed the 