St. Mercurius was a soldier, also known by the name Abu-Seifein, which in Arabic means, “the holder [literally, father] of two swords”, referring to a second sword given to him by Archangel Michael. The vision also led to his conversion to Christianity.
Armed with St. Michael’s sword, Mercurius succeeded, with his army, in routing an invading barbarian army and killing their king.
St. Mercurius attributed his military success to the divine intervention referred to above. After his victory, he refused to pay tribute to the pagan god Artemius and resigned his military commission. For his actions he was executed for his faith.