This article considers the history of Sinop in the first century of Muslim rule, from 1214 to the early fourteenth century, when the city was ruled successively by the Seljuq, Pervaneid and Candarid dynasties. During this period, the Seljuqs constantly vied with Christian Trebizond for control of the city despite both sides being nominally Mongol vassals from the mid-thirteenth century. In the first part of this article, the political history of the city is examined and some significant errors in the chronology are corrected. This is followed by an examination of three formative elements in Sinop’s history in the period: its defences, its trade and Muslim-Christian relations there. The article uses epigraphic evidence from Sinop that has not been considered by previous scholarship in addition to Arabic and Persian chronicles.