Annualy the fourth Sunday of May
being the Sunday near the 28th of May, the date of unification of the United Roman-Ruthenian Church.

This feast was established in honour of the four patronal saints of the Holy Apostolic See of Saints Peter, Andrew, Stephen, and Mark of Rome-Ruthenia, the principle See of the United Roman-Ruthenian Church. The Holy Apostolic See consists of the jurisdictions of the Diocese of Rome-Ruthenia, the Metropolitan See of Aquileia, and the Catholicate of Rome-Ruthenia. These are the episcopal, metropolitan, and patriarchal jurisdictions of the Supreme Pontiff of the United Roman-Ruthenian Church as Prince-Bishop, Metropolitan, and Pope-Catholicos respectively.

Other Key Feasts throughout the Year:

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

Founding of Rome
21 April

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


Date of the Principle Patronal Feast from 2025 - 2124
  • 2025: May 25
  • 2026: May 24
  • 2027: May 23
  • 2028: May 28
  • 2029: May 27
  • 2030: May 26
  • 2031: May 25
  • 2032: May 23
  • 2033: May 22
  • 2034: May 28
  • 2035: May 27
  • 2036: May 25
  • 2037: May 24
  • 2038: May 23
  • 2039: May 22
  • 2040: May 27
  • 2041: May 26
  • 2042: May 25
  • 2043: May 24
  • 2044: May 22
  • 2045: May 28
  • 2046: May 27
  • 2047: May 26
  • 2048: May 24
  • 2049: May 23
  • 2050: May 22
  • 2051: May 28
  • 2052: May 26
  • 2053: May 25
  • 2054: May 24
  • 2055: May 23
  • 2056: May 28
  • 2057: May 27
  • 2058: May 26
  • 2059: May 25
  • 2060: May 23
  • 2061: May 22
  • 2062: May 28
  • 2063: May 27
  • 2064: May 25
  • 2065: May 24
  • 2066: May 23
  • 2067: May 22
  • 2068: May 27
  • 2069: May 26
  • 2070: May 25
  • 2071: May 24
  • 2072: May 22
  • 2073: May 28
  • 2074: May 27
  • 2075: May 26
  • 2076: May 24
  • 2077: May 23
  • 2078: May 22
  • 2079: May 28
  • 2080: May 26
  • 2081: May 25
  • 2082: May 24
  • 2083: May 23
  • 2084: May 28
  • 2085: May 27
  • 2086: May 26
  • 2087: May 25
  • 2088: May 23
  • 2089: May 22
  • 2090: May 28
  • 2091: May 27
  • 2092: May 25
  • 2093: May 24
  • 2094: May 23
  • 2095: May 22
  • 2096: May 27
  • 2097: May 26
  • 2098: May 25
  • 2099: May 24
  • 2100: May 23
  • 2101: May 22
  • 2102: May 28
  • 2103: May 27
  • 2104: May 25
  • 2105: May 24
  • 2106: May 23
  • 2107: May 22
  • 2108: May 27
  • 2109: May 26
  • 2110: May 25
  • 2111: May 24
  • 2112: May 22
  • 2113: May 28
  • 2114: May 27
  • 2115: May 26
  • 2116: May 24
  • 2117: May 23
  • 2118: May 22
  • 2119: May 28
  • 2120: May 26
  • 2121: May 25
  • 2122: May 24
  • 2123: May 23
  • 2124: May 28

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