Saint Pacian (Pacianus) (Catalan: Sant Pacià) (c. 310–391 AD) was an early Spanish Christian prelate.

[2] In his writings, he discussed ecclesiastical discipline, baptism, papal primacy, and teachings on penance against Novatianism, which was then flourishing in Spain.

He is also remembered from a phrase from one of his letters: Christianus mihi nomen est, catholicus vero cognomen ("My name is Christian, my surname is Catholic.").

[3] Pacian was married and had a son, Nummius Aemilianus Dexter, who served under Theodosius I as proconsul and praetorian prefect.

[5] In 2023, a study by Jesús Alturo i Perucho and Tània Alaix i Gimbert has seen the first hunches of Catalan in the writings of Pacian when he uses terms such as ceruulus 'cèrvol' or subinde 'sovint' or uses the expression si te placet for 'si us plau', among many others.