March 13 (Eastern Orthodox liturgics)
Mar. 12 - Eastern Orthodox liturgical calendar - Mar. 14
All fixed commemorations below are observed on March 26 by Orthodox Churches on the Old Calendar.
For March 13th, Orthodox Churches on the Old Calendar commemorate the Saints listed on February 28 (February 29 on leap years).
St. Leander of Seville.
St. Nicephorus the Confessor trampling on the iconoclast Emperor John VII Grammatikos.
Greek Sources
Russian Sources
...
Wikipedia