Eusebius of Nicomedia
Eusebius of Nicomedia (; Ancient Greek: Εὐσέβιος; died 341) was an Arian priest who baptised Constantine the Great on his deathbed in 337. A fifth-century legend evolved that Pope Sylvester I was the one to baptise Constantine, but this is dismissed by scholars as a forgery "to amend the historical memory of the Arian baptism that the emperor received at the end of his life, and instead to attribute an unequivocally orthodox baptism to him".