Saints Mark, Soterikhos, and Valentine were from Asia. They were arrested by the idolaters in the year 304 because they were Christians. After enduring many tortures, they were dragged over sharp stones until they were dead. Later, their holy relics were brought to the island of Thasos, which lies between Thrace and the Athonite peninsula.
These holy martyrs are commemorated on October 24 in Greek usage.