Saint Eustace was a Roman general who converted to Christianity following a divine vision of a cross during a hunt. After his conversion, he faced significant hardships, including the loss of his wealth and a period of exile in Egypt where he was separated from his family. Upon returning to service under Emperor Trajan, he was eventually martyred alongside his wife and two sons under Emperor Hadrian for refusing to participate in pagan sacrifices. He is recognized as a great martyr and an apostle in various Christian traditions.