Saints

• Holy Equals-to-the-Apostles
  Equal-to-apostles
  An equal-to-the-apostles is a special title given to some canonized saints in Eastern Orthodoxy. It is also used by Eastern Rite Catholic Churches that are in communion with Rome...
  
   Emperor Constantine (337), and Helena
  Helena of Constantinople
  Saint Helena also known as Saint Helen, Helena Augusta or Helena of Constantinople was the consort of Emperor Constantius, and the mother of Emperor Constantine I...
  
  , his mother (327)
• Hieromartyrs Timothy, Polius and Eutychius, deacons, in in Mauretania Caesariensis (Morocco).
• Martyrs Polyeuctus, Victorinus, and Donatus, at Caesarea in Cappadocia.
• Hieromartyr Valens and Companions, Bishop who was martyred in Auxerre in France along with three children.
• Martyr Secundinus, in Cordoba in Spain under Diocletian (ca.306)
• Hieromartyr Secundus and those with him, in Alexandria (356)
• Saint Adelphios, Bishop of Onouphis, in Byzantine Egypt (ca.362, or ca.431)
• Saint Hospitius
  Hospitius
  Saint Hospitius was a French recluse who, according to tradition, had been a monk in his native Egypt towards the beginning of the 6th century...
  
   the Hermit of Nice, Wonderworker (581)
• Saint Barrfoin (Bairrfhionn, Barrindus) of Killbarron
  Kilbarron, North Tipperary
  Kilbarron is a civil parish and a townland in the historical barony of Ormond Lower, North Tipperary in Ireland. It is located west of Borrisokane....
  
   (6th c.)
• Saint Gollen (Collen, Colan) of Denbighshire, a saint who has given his name to Llangollen
  Llangollen
  Llangollen is a small town and community in Denbighshire, north-east Wales, situated on the River Dee and on the edge of the Berwyn mountains. It has a population of 3,412.-History:...
  
   in Wales (7th c.)
• Saint Boros, monk.
• Saint Isberga (Itisberga) of Aire, reputed sister of Charlemagne, nun at Aire (Aria) in the Artois, of which she is the patroness (ca.800)
• Saint Ageranus (Ayran, Ayrman) of Beze
  Bèze
  Bèze is a commune in the Côte-d'Or department in eastern France.-Population:-External links:*...
  
  , a monk at Bèze in France, martyred by the Vikings (888)
• Saint Christopher I, Patriarch of Antioch (967)
• Saint Theobald (Thibaud), Archbishop of Vienne (970-1001)
• Blessed Constantine
  Konstantin of Murom
  The Holy and Blessed Prince Constantine of Murom was a direct descendant of Vladimir I of Kiev and the son of Prince Svyatoslav of Chernigov. His father at his request assigned him to rule the city of Murom, which at the time was inhabited by pagans, that he might spread Christianity in that...
  
   (Yaroslav), prince, and his children Michael and Theodore, Wonderworkers of Murom
  Murom
  Murom is a historic city in Vladimir Oblast, Russia, which sprawls along the left bank of Oka River. Population: -History:In the 9th century CE, the city marked the easternmost settlement of the Eastern Slavs in the land of the Finno-Ugric people called Muromians. The Russian Primary Chronicle...
  
   (1129)
• Saint Cyril II (Kirill), Bishop of Rostov
  Rostov
  Rostov is a town in Yaroslavl Oblast, Russia, one of the oldest in the country and a tourist center of the Golden Ring. It is located on the shores of Lake Nero, northeast of Moscow. Population:...
  
   (1262)
• Saint Basil of Ryazan
  Ryazan
  Ryazan is a city and the administrative center of Ryazan Oblast, Russia. It is located on the Oka River southeast of Moscow. Population: The strategic bomber base Dyagilevo is just west of the city, and the air base of Alexandrovo is to the southeast as is the Ryazan Turlatovo Airport...
  
  , Bishop (1295)
• Saint Helen of Decani, Serbia, Princess (ca. 1350)
• Saint Cassian the Greek, monk of Uglich
  Uglich
  Uglich is a historic town in Yaroslavl Oblast, Russia, which stands on the Volga River. Population: A local tradition dates the town's origins to 937. It was first documented in 1148 as Ugliche Pole...
  
  , Wonderworker (1504)
• Saint Agapitus of Marku-shev (Vologda
  Vologda
  Vologda is a city and the administrative, cultural, and scientific center of Vologda Oblast, Russia, located on the Vologda River. The city is a major transport knot of the Northwest of Russia. Vologda is among the Russian cities possessing an especially valuable historical heritage...
  
  ) the Hieromartyr, Abbot (1584)
• Saint Constantine the Fool-for-Christ, of Novotorzanin, Russia (ca.16th c.)
• New Martyrs King Constantine Brancoveanu
  Constantin Brâncoveanu
  Constantin Brâncoveanu was Prince of Wallachia between 1688 and 1714.-Ascension:A descendant of the Craioveşti boyar family and related to Matei Basarab, Brâncoveanu was born at the estate of Brâncoveni and raised in the house of his uncle, stolnic Constantin Cantacuzino...
  
   of Wallachia and his four sons Constantine, Stephen, Radu, and Matthew, and his counsellor Ianache (1714)
• Martyr Pachomios of Patmos (1730)

Other commemorations

• Synaxis of the “Vladimir” Icon of the Most Holy Theotokos (1521)
• Synaxis of the "Virgin of Tenderness" Icon of the Most Holy Theotokos from Pskov-Pechersk (1524)
• Uncovering of the relics (1998) of St. Andrew Ogorodnikov, fool-for-Christ of Simbirsk (1841)
• Repose of Elena Pavlova of Chepel, Kharkov (1885)
• Repose of Elder Isaac of Dionysiou Monastery
  Dionysiou monastery
  Dionysiou monastery is an Eastern Orthodox monastery at the monastic state of Mount Athos in Greece in southwest part of Athos peninsula. The monastery ranks fifth in the hierarchy of the Athonite monasteries...
  
   of Mount Athos
  Mount Athos
  Mount Athos is a mountain and peninsula in Macedonia, Greece. A World Heritage Site, it is home to 20 Eastern Orthodox monasteries and forms a self-governed monastic state within the sovereignty of the Hellenic Republic. Spiritually, Mount Athos comes under the direct jurisdiction of the...
  
   (1932)
• Synaxis of Hieromartyrs of Karelia
  Karelia
  Karelia , the land of the Karelian peoples, is an area in Northern Europe of historical significance for Finland, Russia, and Sweden...
  
  .
• Synaxis of Hieromartyrs of Ufa
  Ufa
  -Demographics:Nationally, dominated by Russian , Bashkirs and Tatars . In addition, numerous are Ukrainians , Chuvash , Mari , Belarusians , Mordovians , Armenian , Germans , Jews , Azeris .-Government and administration:Local...
  
  .

Sources

• May 21/June 3. Orthodox Calendar (PRAVOSLAVIE.RU).
• June 3 / May 21. HOLY TRINITY RUSSIAN ORTHODOX CHURCH (A parish of the Patriarchate of Moscow).
• May 21. Latin Saints of the Orthodox Patriarchate of Rome.
• May 21. The Roman Martyrology.

• 21 ΜΑΪΟΥ. ΜΕΓΑΣ ΣΥΝΑΞΑΡΙΣΤΗΣ.