Pope Eleutherius

Pope Eleutherius (Greek: Ελευθέριος; died 24 May 189), also known as Eleutherus (Greek: Ελεύθερος), was the bishop of Rome from c. 174 until his death in 189. His pontificate is alternatively dated to 171–185 or 177–193. He is venerated as a saint in the Catholic Church.

He is linked to a number of legends; one of them credited him with receiving a letter from "Lucius, King of Britain".

Source: Wikipedia — https://en.wikipedia.org/wiki/Pope_Eleutherius