Tympanum of the southern door of the Cathedral of Amiens, showing the life of Saint Honoratus of Amiens, including his appointment as bishop, and translation of his relics.
The notation Old Style or (OS) is sometimes used to indicate a date in the Julian Calendar (which is used by churches on the "Old Calendar"). The notation New Style or (NS), indicates a date in the Revised Julian calendar (which is used by churches on the "New Calendar").
It is well known that under the reign Shapur (309-379), Ardashir II had served as governor-King of Adiabene, where he had reportedly persecuted Christians.
He is also commemorated on October 8 on the celebration of the "Synaxis of the Saints of Vyatka".[34] Saint Matthew was born in the city of Vyatka (now Kirov); in 1891 he became a monk at the Monastery of St. Alexander Nevsky, and was tonsured with the name Matthew; here he practiced asceticism, obedience, and unceasing prayer, and God blessed him as a Wonderworker. He reposed in peace in 1927.
(in Greek) Συναξαριστής. 16 Μαΐου. ECCLESIA.GR. (H ΕΚΚΛΗΣΙΑ ΤΗΣ ΕΛΛΑΔΟΣ).
Russian Sources
(in Russian)29 мая (16 мая). Православная Энциклопедия под редакцией Патриарха Московского и всея Руси Кирилла (электронная версия). (Orthodox Encyclopedia - Pravenc.ru).