325 Roman emperor Constantine called the Council of Nicaea, the first
ecumenical Christian council.
685 The Battle of Dunnichen or Nechtansmere was fought
between a Pictish army under King Bridei III and the invading Northumbrians
under King Ecgfrith, who were decisively defeated.
1217 The Second Battle of
Lincoln was fought near Lincoln, England, resulting in the defeat of Prince
Louis of France by William Marshal, Earl of Pembroke.