According to tradition , she was the daughter of a senator named Philophronos and his wife Theodosia in Chalcedon , located across the Bosporus from the city of Byzantium ( modern - day Istanbul ) .
St. Euphemia lived on the cusp of the 3rd and 4th centuries AD .
According to tradition , St. Euphemia was the St. Euphemia of a senator named Philophronos and his wife Theodosia in Chalcedon , located across the Bosporus from the city of Byzantium ( modern - day Istanbul ) .
St. Euphemia lived on the cusp of the 3rd and 4th centuries AD .