- 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.
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An onomastic calendar: August
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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.
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