An onomastic calendar: August

• August 1: Justinian I became sole ruler of the Byzantine Empire in 527.
• August 2: Pope Severinus died in 640.
• August 3: Saint’s day of Olaf II of Norway.
• August 4: Berengar II of Italy died in 699.
• August 5: Alexander I Jagiellon was born in 1461.
• August 6: Saint Dominic, founder of the Dominican Order, died in 1221.
• August 7: Otto I of Germany was crowned in 936.
• August 8: Conrad Lycosthenes, humanist and ecyclopedist, was born in 1518.
• August 9: Arnold Fitz Thedmar, London chronicler, was born in 1201.
• August 10: Eleanor, the maid of Brittany, died in 1241.
• August 11: Mary of York was born in 1467.
• August 12: Christian III of Denmark was born in 1503.
• August 13: Alfonso XI of Castille was born in 1311.
• August 14: Duncan I of Scotland was murdered in 1040.
• August 15: Carolingian military leader Roland died in 778.
• August 16: Philippa of Clarence, Countess of Ulster, was born in 1355.
• August 17: Cesare Borgia became the first person to resign a cardinalcy in 1498.
• August 18: Saint Clare of Montefalco died in 1308.
• August 19: Catherine of Bohemia was born in 1342.
• August 20: Stephen I of Hungary was canonized in 1083.
• August 21: Philip II of France was born in 1165.
• August 22: Saint Columba sees the Loch Ness monster in 565.
• August 23: William Wallace was executed for treason in 1305.
• August 24: Italian painter Lavinia Fontana was born in 1552.
• August 25: Anna of Saxony married William of Orange in 1561.
• August 26: Thomas Bradwardine, logician, mathematician, and archbishop died in 1349.
• August 27: Arthur II, Duke of Brittany, died in 1321.
• August 28: Saint Augustine of Hippo died in 430.
• August 29: Hungarian poet Janus Pannonius was born in 1434.
• August 30: Amalasuntha became queen regent of the Ostrogoths in 524.

An onomastic calendar: December

• December 1: Anna Komnene was born in 1083.
• December 2: Gerard Mercator died in 1594.
• December 3: Berengar I was crowned Holy Roman Emperor in 915.
• December 4: Theobald II of Navarre died in 1270.
• December 5: Pope Julius II was born in 1443.
• December 6: Baldassare Castiglione was born in 1478.
• December 7: Saint Columba was born in 521.
• December 8: Mary Queen of Scots was born in 1542.
• December 9: Malcolm IV of Scotland died in 1165.
• December 10: Afonso de Albuquerque conquered Goa in 1510.
• December 11: Llywellyn, last sovereign Prince of Wales, died in battle in 1282.
• December 12: Stephen Báthory, king of Poland, died in 1586.
• December 13: Pope Celestine V resigns the papacy in 1294.
• December 14: James V of Scotland died in 1542.
• December 15: Basil II, emperor of the Byzantine Empire, died in 1025.
• December 16: Henry VI was crowned king of France in 1431.
• December 17: William I Longsword was assassinated in 942.
• December 18: Theodulf of Orleans died in 821.
• December 19: Agnes, Duchess of Burgundy, died in 1327.
• December 20: Margaret of Provence, queen of France, died in 1295.
• December 21: Pope Honorius II was elected in 1124.
• December 22: Stephen of Blois was crowned king of England in 1135.
• December 23: Berengaria of Navarre, Queen of England, died in 1230.
• December 24: Constance of Austria, queen of Poland, was born in 1588.
• December 25: Merry Christmas!
• December 26: Arthur III of Brittany died in 1458.
• December 27: German mathematician Johannes Kepler was born in 1571.
• December 28: Alaric II became king of the Visigoths in 484.
• December 29: Thomas Beckett was murdered in 1170.
• December 30: Vasily I of Moscow was born in 1371.
• December 31: Eleonora Gonzaga was born in 1493.