1223

Events

• Livonian Crusade: Estonians revolt against the Livonian Brothers of the Sword and Denmark, and for a brief period reconquer all of their strongholds except Tallinn.
• The Tatar Yoke in Russia begins when the Mongolian army invades, after 87 years of the dominance of the Novgorod Republic state.

  Births

• Baibars, Mamluk Sultan of Egypt and Syria
• Hugh le Despencer, 1st Baron le Despencer
• John FitzAlan, 6th Earl of Arundel
• probable
• *Eleanor of Provence, queen consort of England
• *Llywelyn ap Gruffudd, last native prince of Wales
• *Stefan Uroš I, the King of Serbia

  Deaths

• March 8 - Wincenty Kadłubek, Polish bishop and historian
• March 25 - King Afonso II of Portugal
• July 14 - King Philip II of France
• date unknown
• *Giraldus Cambrensis Cambro-Norman clergyman and chronicler
• *Mstislav III of Kiev
• * Ada, Countess of Holland, ruler
• *Muqali, Mongol general
• *Unkei, Japanese sculptor