May 21 (old calendar) / June 3 (new) Holy Equals-to-the-Apostles Emperor Constantine and his mother, Helen (Elena) (327). St. Constantine (1129) and his children, Ss. Michael and Theodore, Wonderworkers of Múrom. Ven. Cassian the Greek, of Uglich (1504). The Meeting of the VLADIMIR Icon of the Most-holy Theotokos (in commemoration of the saving of Moscow from the invasion of the Crimean Khan, Mekhmet-Girei in 1521). SAINTS CONSTANTINE AND HELEN The