Events By place Europe A civil war breaks out on Gotland between the burghers of Visby and the rural farmers of Gotland; while the exact reason for this war is unknown, the most likely reason is the construction of a large wall around Visby, and the introduction of a toll, which the farmers were forced to pay. June 5 – War of the Limburg Succession – Battle of Worringen: Brabantian forces under Duke John I defeat the coalition army of Cologne, Luxemburg, and Nassau at Worringen (in a struggle to conquer the Duchy of Limburg). John liberates the city of Cologne from rule by the Electorate of Cologne, which has previously been one of the major ecclesiastical principalities of the Holy Roman Empire. Summer – Sultan Muhammad II drives the rebellious Banu Ashqilula from one stronghold to the next, where they are finally expelled from Granadan territory in Al-Andalus (modern Spain). Meanwhile, Muhammad manages through diplomatic intrigue, to turn the Castilian aristocracy against King Sancho IV. In response, King Alfonso III proclaims the 18-year-old Alfonso de la Cerda as ruler of Castile and León.Joseph F. O'Callaghan (2011). The Gibraltar Crusade: Castile and the Battle for the Strait, pp. 95–96. . August 8 – Pope Nicholas IV proclaims a crusade against the 26-year-old King Ladislaus IV, who had lost credibility by favoring his semi-pagan Cuman subjects in Hungary, and in general refusing to conform to the social standards of Western Europe. Meanwhile, the Hungarian government loses more power because the clergy and most of the nobles rule the kingdom independently.Engel, Pál (2001). The Realm of St. Stephen: A History of Medieval Hungary, 895–1526, p. 109. Tauris Publishers. .Kontler, László (1999). Millennium in Central Europe: A History of Hungary, p. 84. Atlantisz Publishing House. . October 28 – Treaty of Canfranc: King Edward I signs an agreement with Alfonso III at Canfranc, about the release of Charles II, who has been captured by Admiral Roger of Lauria in the Battle of the Gulf of Naples (see 1284).Runciman, Steven (1958). The Sicilian Vespers: A History of the Mediterranean World in the Later Thirteenth Century, p. 246. Cambridge University Press. .
Events By place Europe A civil war breaks out on Gotland between the burghers of Visby and the rural farmers of Gotland; while the exact reason for this war is unknown the most likely reason is the construction of a large wall around Visby and the introduction of a toll which the farmers were forced to pay June 5 – War of the Limburg Succession – Battle of Worringen Brabantian forces under Duke John I defeat the coalition army of Cologne Luxemburg and Nassau at Worringen (in a struggle to conquer the Duchy of Limburg) John liberates the city of Cologne from rule by the Electorate of Cologne which has previously been one of the major ecclesiastical principalities of the Holy Roman Empire Summer – Sultan Muhammad II drives the rebellious Banu Ashqilula from one stronghold to the next where they are finally expelled from Granadan territory in Al-Andalus (modern Spain) Meanwhile Muhammad manages through diplomatic intrigue to turn the Castilian aristocracy against King Sancho IV In response King Alfonso III proclaims the 18-year-old Alfonso de la Cerda as ruler of Castile and LeónJoseph F O'Callaghan (2011) The Gibraltar Crusade Castile and the Battle for the Strait pp 95–96  August 8 – Pope Nicholas IV proclaims a crusade against the 26-year-old King Ladislaus IV who had lost credibility by favoring his semi-pagan Cuman subjects in Hungary and in general refusing to conform to the social standards of Western Europe Meanwhile the Hungarian government loses more power because the clergy and most of the nobles rule the kingdom independentlyEngel Pál (2001) The Realm of St Stephen A History of Medieval Hungary 895–1526 p 109 Tauris Publishers Kontler László (1999) Millennium in Central Europe A History of Hungary p 84 Atlantisz Publishing House  October 28 – Treaty of Canfranc King Edward I signs an agreement with Alfonso III at Canfranc about the release of Charles II who has been captured by Admiral Roger of Lauria in the Battle of the Gulf of Naples (see 1284)Runciman Steven (1958) The Sicilian Vespers A History of the Mediterranean World in the Later Thirteenth Century p 246 Cambridge University Press 