You are hereHomeBARSeptember/October 1978How It Came About: From Saturday to Sunday Eusebius, Historia ecclesiastica 3, 27, 3; cf. 4, 5, 211; Epiphanius, Adversus haereses 70, 10, PG 42, 355356. Join the BAS Library! Already a library member? Log in here. Institution user? Log in with your IP address.