San Giovanni Evangelista is a church in Ravenna, Italy.
It was built in the fifth century AD by the Roman imperial princess Galla Placidia "in fulfilment of a vow made by her to S. John Evangelist, when, on her way from Constantinople to Ravenna, she was in danger of shipwreck. Agnellus tells us that of old the church bore an inscription to this effect, and he gives it to us: Sancto ac Beatissimo Apostolo Johanni Evangelistae Galla Placidia Augusta cum filio suo Placidio Valentiniano Augusto et filia sua Justa Grata Honoria Augusta, Liberationis periculum maris votum solvientes.
Wikipedia https://en.wikipedia.org/wiki/San_Giovanni_Evangelista,_Ravenna
Address 10 Via Giosuè Carducci, Ravenna 48121, Italy
Coordinates 44°25'6.038" N 12°12'20.451" E
