Beylik of Tacettin (Tacettinoğulları, Tacettinids) was a small Turkmen principality in Anatolia in the 14th and 15th centuries.
Tacettin of Canik founded his small beylik in and around Niksar, mid-north Anatolia in 1348.
In 1386 he fell in the battle during his campaign to Hacıemir controlled Ordu (ancient Cotyora).
During the early years of Mahmut's reign, the beylik was between two great powers: namely the Ottoman Empire to the southwest and Kadı Buhanettin to the south.
[2] In 1402 Turkic warlord Timur invaded Anatolia and defeated Bayezit in the battle of Ankara.