他提安（Tatian）是亚述人，受过希腊哲学和文学的教育。于150年至165年信仰基督教，且是游斯丁的学生。该撒利亚的优西比乌指出后来他成为异端，在172年创建禁戒派（Encratites）的灵智宗（诺斯底派）。他写过一本护教书（Apologies）《Oratio ad Graecos》，对于基督教神圣纯洁及神圣的时代做辩护。他依据四福音中耶稣生平事迹编了一本《四福音合参》（Diatessaron），成为叙利亚教会（Syriac Orthodox Church）的经典。爱任纽、特土良、亚历山大的革利免都是他的敌对作家。

Tatian the Assyrian (/ˈteɪʃən, -iən/; Latin: Tatianus; Greek: Τατιανός; Syriac: ܛܸܛܝܢܐ; c. 120 – c. 180 AD) was an Assyrian early Christian writer and theologian of the 2nd century.

Tatian's most influential work is the Diatessaron, a Biblical paraphrase, or "harmony", of the four gospels that became the standard text of the four gospels in the Syriac-speaking churches until the 5th-century, after which it gave way to the four separate gospels in the Peshitta version.