Saint Euphemia (Greek: Ευφημία Late Koine Greek [efiˈmia]), “well-spoken [of]”, known as the All-praised in the Orthodox Church, is a Christian saint, who was martyred for her faith in 303 AD. According to Christian tradition, this occurred at Chalcedon.

Euphemia – Wikipedia

https://en.wikipedia.org/wiki/Euphemia

Saint Euphemia (Greek: Ευφημία Late Koine Greek [efiˈmia]), “well-spoken [of]”, known as the All-praised in the Orthodox Church, is a Christian saint, who was martyred for her faith in 303 AD. According to Christian tradition, this occurred at Chalcedon.