Amasea (died by 319), a warrior saint, and the local bishop Asterius of Amasea (died c. 410), some of whose polished sermons survive, are notable Christian figures from the period. In 2013, a 24-square-meter christian mosaic belonging to the floor of a chapel was discovered, near a site where an illegal archaeological dig had been attempted. The mosaic, depicts apples, an apple tree, partridges and many geometric figures. Early Turkish rulers In 1075, ending 700 years of Byzantine rule, Amasya was conquered by the Turkmen Danishmend emirs. It served as their capital until the annexation of the Danishmendid dominions by the Seljuk ruler Kilij Arslan II. When he died, his realm was divided among his sons, and Amasya passed to Nizam ad-Din Arghun Shah. His rule was brief, as he lost it to his brother Rukn ad-Din Suleiman Shah, who subsequently became Sultan. During the 13th century the city passed under the control of the Mongol Ilkhanate, and was ruled by Mongol governors, except for a brief rule by Taj ad-Din Altintash, son of the last Seljuk sultan, Mesud II. Under the Seljuks and the Ilkhan, the city became a centre of Islamic culture and produced some notable individuals such as Yaqut al-Musta'simi (1221-1298) calligrapher and secretary of the last Abbasid caliph who was a Greek native of Amasya. Schools, mosques, tombs and other architecture of this period still remain. In 1341, the emir Habiloghlu occupied the city, before it came under the rule of the Eretnid emirate. Hadji Shadgeldi Pasha took Amasya from the Eretnids under Ali Bey, and successfully fended off the claims of Kadi Burhan al-Din, who had supplanted the Eretnids. Shadgeldi was succeeded by his son Ahmed, who managed to retain his autonomy for a while, with Ottoman assistance; but in 1391/92, the mounting pressure forced him to cede the city to the Ottoman sultan Bayezid I, who installed his son, the future Mehmed I, as its governor. Ottoman era After the disastrous Battle of Ankara in 1402, Mehmed I fled to Amasya, which (along with nearby Tokat) became his main residence and stronghold during the Ottoman Interregnum. As a result, the city enjoyed a special status under the Ottomans. A number of Ottoman princes were sent to the province of Amasya (the Rûm Eyalet) as governors in their youth, from Mehmed II in the late 14th century to Bayezid II in the 15th century, through