sentences:  Typically, he was based at Galata and Gallipoli during the winter and charged with annual sailings during the summer months.The title of "Kapudan Pasha" itself is only attested from 1567 onwards; earlier designations for the supreme commander of the fleet include ("bey of the sea") and ("head captain").The title "Derya Bey" was first granted during the reign of Bayezid I as an official rank within the state structure.