•
March 18 –
Battle of Chmielnik (
Mongol invasion of Poland): The
Mongols overwhelm the feudal Polish armies of
Sandomierz and
Kraków provinces, and plunder the abandoned city of Kraków. •
April 9 –
Battle of Legnica: The
Mongols, under the command of
Baidar,
Kadan and
Orda Khan, defeat the feudal
Polish nobility, including the
Knights Templar. •
April 11 –
Battle of Mohi:
Batu Khan and
Subutai defeat
Béla IV of Hungary. The battle is the last major event in the
Mongol Invasion of Europe. •
May –
Battle of Giglio: an
Imperial fleet defeats a
Genoan fleet in the
Tyrrhenian Sea. •
May 10 – Battle of Cameirge in
Ulster: The
Milesian Irish septs of the
Ó Dónaills from
Donegal, the
Ó Néills from
Armagh and the
Ó Dochartaighs of
Connacht defeat the last
Tuatha Dé Danann sept, the
Meic Lochlainn of
Tír Eoghain and
Inishowen under Domhnall mac Muirchertaigh Mac Lochlainn. From now on the
Kings of Tír Eoghain will all be of the Ó Néill dynasty,
Brian Ua Néill becoming sole ruler. • Early northern summer – A succession crisis or other priorities results in the Mongols withdrawing behind their river barrier into Ukraine and the Russias, leaving Central Asian and far Eastern Europe peoples tributary to the Khanates, but leaving Poland and Hungary to begin recovery and reorganization. •
August 29 – After
Henry III of England's invasion of
Wales, the
Treaty of Gwerneigron is signed by him and
Dafydd ap Llywelyn, curbing the latter's authority and denying him royal title. •
September 23 –
Snorri Sturluson, Icelandic saga writer, is murdered by
Gissur Þorvaldsson, an emissary of King
Haakon IV of Norway. •
December –
Siege of Lahore (1241): The
Mongols under Tair Bahadur besiege and sack the city of
Lahore in the
Delhi Sultanate. •
December 11 –
Ögedei Khan dies after a drinking binge. His death halts the Mongol advance into Western Europe. •
Emperor Lizong of Song China accepts the
Neo-Confucian teachings of the late
Zhu Xi, including his commentary on the
Four Books. This will have an impact upon the philosophical schools of surrounding countries as well, including
Korea,
Japan, and
Vietnam. •
Livonian Crusade: The
Estonian rebellion of
1237 is suppressed on
Saaremaa Island, by the
Livonian Order. • The
University of Valladolid is founded in
Spain. == Births ==