PRINCIPAL PATRONAL FEAST OF THE UNITED ROMAN-RUTHENIAN CHURCH
Feast of Saints Peter, Andrew, Stephen, and Mark
Commemoration of Saints George the Victory-Bringer, and Vladimir and Olga, Equal-to-the-Apostles
The fourth Sunday of May, being the Sunday near the 28th of May, the date of unification of the United Roman-Ruthenian Church.

Read more about the Principle Patronal Feast here.

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United Roman-Ruthenian Church and Catholicate of Rome-Ruthenia
Sts. Peter and Andrew, Apostles - 29 June and 30 November

Pontifical Imperial State
Sts. Peter and Paul, Apostles - 29 June

Diocese of Rome-Ruthenia
St. Stephen the Deacon and Protomartyr - 3 August and 26 December

Metropolitan See of Aquileia
St. Mark the Apostle - 25 April

Pontifical Kingdom of Ruthenia
St. George, Martyr and St. Vladimir of Kiev - 23 April and 15 July

Apostolic Founder
St. Edwin Caudill - 25 October

Holy Fathers
Pope St. Leo X and St. Archbishop Aftimios - 1 December and 24 July

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Also...

Founding of Rome
21 April

Founding of Ruthenia and the Old Russian State
Feast St. Vladimir of Kiev - 15 July