Annually on the fourth Sunday of May
Being the Sunday near 28 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 principal 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
Pontifical Imperial State
Sts. Peter and Paul, Apostles
Diocese of Rome-Ruthenia
St. Stephen the Deacon and Protomartyr
Metropolitan See of Aquileia
St. Mark the Apostle
Pontifical Kingdom of Ruthenia
St. George, Martyr, and St. Vladimir of Kiev
Apostolic Founder
St. Edwin Caudill
Holy Fathers
Pope St. Leo X and St. Archbishop Aftimios
Founding of Rome
Anniversary of the founding of Rome
Founding of Ruthenia and the Old Russian State
Feast of St. Vladimir of Kiev
Dates of the Principal Patronal Feast, 2025–2124
Note: When the feast coincides with a feast of greater rank, being Pentecost or Trinity Sunday, it is moved to the Sunday within the Octave of Corpus Christi.
2025–2034
- 2025: May 25
- 2026: May 24 (Pentecost Sunday)
- 2027: May 23 (Trinity Sunday)
- 2028: May 28
- 2029: May 27 (Trinity Sunday)
- 2030: May 26
- 2031: May 25
- 2032: May 23 (Trinity Sunday)
- 2033: May 22
- 2034: May 28 (Pentecost Sunday)
2035–2044
- 2035: May 27
- 2036: May 25
- 2037: May 24 (Pentecost Sunday)
- 2038: May 23
- 2039: May 22
- 2040: May 27 (Trinity Sunday)
- 2041: May 26
- 2042: May 25 (Pentecost Sunday)
- 2043: May 24 (Trinity Sunday)
- 2044: May 22
2045–2054
- 2045: May 28 (Pentecost Sunday)
- 2046: May 27
- 2047: May 26
- 2048: May 24 (Pentecost Sunday)
- 2049: May 23
- 2050: May 22
- 2051: May 28 (Trinity Sunday)
- 2052: May 26
- 2053: May 25 (Pentecost Sunday)
- 2054: May 24 (Trinity Sunday)
2055–2064
- 2055: May 23
- 2056: May 28 (Trinity Sunday)
- 2057: May 27
- 2058: May 26
- 2059: May 25 (Trinity Sunday)
- 2060: May 23
- 2061: May 22
- 2062: May 28
- 2063: May 27
- 2064: May 25 (Pentecost Sunday)
2065–2074
- 2065: May 24 (Trinity Sunday)
- 2066: May 23
- 2067: May 22 (Pentecost Sunday)
- 2068: May 27
- 2069: May 26
- 2070: May 25 (Trinity Sunday)
- 2071: May 24
- 2072: May 22
- 2073: May 28
- 2074: May 27
2075–2084
- 2075: May 26 (Pentecost Sunday)
- 2076: May 24
- 2077: May 23
- 2078: May 22 (Pentecost Sunday)
- 2079: May 28
- 2080: May 26 (Pentecost Sunday)
- 2081: May 25 (Trinity Sunday)
- 2082: May 24
- 2083: May 23 (Pentecost Sunday)
- 2084: May 28
2085–2094
- 2085: May 27
- 2086: May 26 (Trinity Sunday)
- 2087: May 25
- 2088: May 23
- 2089: May 22 (Pentecost Sunday)
- 2090: May 28
- 2091: May 27 (Pentecost Sunday)
- 2092: May 25 (Trinity Sunday)
- 2093: May 24
- 2094: May 23 (Pentecost Sunday)
2095–2104
- 2095: May 22
- 2096: May 27
- 2097: May 26 (Trinity Sunday)
- 2098: May 25
- 2099: May 24
- 2100: May 23 (Trinity Sunday)
- 2101: May 22
- 2102: May 28 (Pentecost Sunday)
- 2103: May 27
- 2104: May 25
2105–2114
- 2105: May 24 (Pentecost Sunday)
- 2106: May 23
- 2107: May 22
- 2108: May 27 (Trinity Sunday)
- 2109: May 26
- 2110: May 25 (Pentecost Sunday)
- 2111: May 24 (Trinity Sunday)
- 2112: May 22
- 2113: May 28 (Trinity Sunday)
- 2114: May 27
2115–2124
- 2115: May 26
- 2116: May 24 (Trinity Sunday)
- 2117: May 23
- 2118: May 22
- 2119: May 28
- 2120: May 26
- 2121: May 25 (Pentecost Sunday)
- 2122: May 24 (Trinity Sunday)
- 2123: May 23
- 2124: May 28 (Trinity Sunday)