31 March 1146 – Bernard of Clairvaux preaches his famous sermon in a field at Vézelay, urging the necessity of a Second Crusade. Louis VII is present, and joins the Crusade.
30 March 1296 – Edward I sacks Berwick-upon-Tweed, during armed conflict between Scotland and England.
29 March 1461 – Wars of the Roses: Battle of Towton – Edward of York defeats Queen Margaret to become King Edward IV of England.
28 March 845 – Paris is sacked by Viking raiders, probably under Ragnar Lodbrok, who collects a huge ransom in exchange for leaving from Charles the Bald (pcitured left).
27 March 1309 – Pope Clement V excommunicates Venice and all its population, completely ruining the day for about 100,000 people!
John Julius Norwich might tell you why...
26 March 1484 – William Caxton prints his translation of Aesop's Fables. And the moral of the story is...
as an ebook!
25 March 1306 – Robert the Bruce becomes King of Scotland.
24 March 1401 – Turko-Mongol emperor Timur sacks Damascus.
23 March 1429 – Birth of Margaret of Anjou, wife of Henry VI of England (d. 1482)
22 March 1599 – Birth of Anthony van Dyck, Flemish painter (d. 1641), inventor of cute little beards. 
21 March 1556 – In Oxford, Archbishop of Canterbury Thomas Cranmer is burned at the stake.
- they got an actor who looked just like him!
20 March 1390 – Death of Alexios III, Emperor of Trebizond (b. 1338)
19 March 1279 – A Mongolian victory in the Battle of Yamen ends the Song Dynasty in China.Khan: Empire of Silver: A Novel of the Khan Empire.
18 March 1314 – Jacques de Molay, the 23rd and the last Grand Master of the Knights Templar, is burned at the stake.
17 March 1337 – Edward, the Black Prince is made Duke of Cornwall, the first Duchy made in England.
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16 March 1190 – Massacre of Jews at Clifford's Tower, York.