- October 1: Edgar I was crowned King of the English in 959.
- October 2: Athalaric, king of the Ostrogoths, died in 543.
- October 3: Saint Francis of Assisi died in 1226.
- October 4: Saint Theresa of Avila died in 1582
- October 5: Alexios III of Trebizond was born in 1338.
- October 6: Samuel Tsar of Bulgaria died in 1014.
- October 7: Frederick I of Norway and Denmark was born in 1471.
- October 8: Demetrius Zvonimir was crowned king of Croatia in 1076.
- October 9: Denis, the Poet King of Portugal, was born in 1261.
- October 10: Pope Valentine died in 827.
- October 11: Pope Boniface died in 1303.
- October 12: Edwin King of Northumbria was killed in battle in 632/633.
- October 13: Eleanor, Queen of Castile, was born in 1162.
- October 14: William the Bastard won the Battle of Hastings in 1066.
- October 15: Pope Gregory XIII’s calendrical reform came into use in 1582.
- October 16: Jadwiga was crowned King of Poland in 1384.
- October 17: St. Ivo of Kermartin was born in 1253.
- October 18: Dagobert I was crowned king of the Franks in 629.
- October 19: St. Frideswide died in 727.
- October 20: Henry X of Bavaria died in 1139.
- October 21: Ferdinand Magellan discovered the Straits of Magellan in 1520.
- October 22: Charles Martel, king of the Franks, died in 741.
- October 23: Sweyn III of Denmark is killed in 1157.
- October 24: (DMNES team was out of town w/o internet access).
- October 25: Henry V of England defeated the French at Agincourt in 1415.
- October 26: Feast day of St Demetrius of Thessaloniki, who died in 306.
- October 27: Emperor Constantine had his Vision of the Cross in 312.
- October 28: Margaret I of Denmark died in 1412.
- October 29: Conradin, king of Sicily and Jerusalem, died in 1268.
- October 30: Cesare Borgia hosted the Banquet of Chestnuts in 1501.
- October 31: Nikephoros I became Byzantine emperor in 802.
An onomastic calendar: October
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