Jordan desert, Saint Panteleimon the All-Merciful Feast Date: July27 Icon of Saint Panteleimon, with scenes from his life, 13th century ( Saint Catherine's Monastery , Mount Sinai ). Saint Panteleimon the Healer , by Nicholas Roerich , 1916. Church of St. Panteleimon, built in 1735-39, is one of the oldest in St.