The ancient Irish Kingdom of Breifne splits into East Breifne and West Breifne, after a war between the O'Reillys and the O'Rourkes. Levant Venetian–Genoese War: A dispute between Venice and Genoa arises about concerning land in Acre owned by Mar Saba but claimed by both Venice and Genoa – which leads to a Genoese attack of the monastery in the Venetian quarter. The Venetians are supported by Pisa and the Knights Templar, while the Genoese are joined by the Knights Hospitaller. Asia October – The Japanese Kenchō era ends and the Kōgen era begins during the reign of the 13-year-old Emperor Go-Fukakusa. By topic Natural Disaster June 30 – A large volcanic eruption in Harrat Rahat (near Medina) is associated with an Islamic prophecy. Religion May 4 – Pope Alexander IV issues the papal bull Licet ecclesiae catholicae, constituting the Order of Saint Augustine at Lecceto Monastery. August 25 – In Bologna, slavery and serfdom are abolished; this event is recorded in the document called Liber Paradisus (or Heaven Book). Births January 6 – Gertrude the Great, German mystic (d. 1302) January 24 – Alonso Pérez de Guzmán, Spanish nobleman (d. 1309) February 9 – William de Warenne, English nobleman (d. 1286) March 21 – Henry I (Lackland), German nobleman (d. 1318) October 23 – Möngke Temür, Mongol ruler of Shiraz (d. 1282) Abu Hayyan al-Gharnati, Andalusian grammarian (d. 1344) Adolph VI, count of Holstein-Pinneberg-Schauenburg (d. 1315) Ahmad al-Suhrawardi, Persian calligrapher and musician (d. 1340) Al-Dimashqi, Syrian geographer, explorer and writer (d. 1327) Andrea Dotti, Italian nobleman, preacher and saint (d. 1315) Ibn al-Banna, Almohad scholar and mathematician (d. 1321) Jamal al-Din al-Mizzi, Syrian scholar and philologist (d. 1341) John Segrave, English nobleman and seneschal (d. 1325) Padishah Khatun, Mongol female ruler and writer (d. 1295) Robert of Clermont, French prince and nobleman (d. 1317) Roger Mortimer, English nobleman and constable (d. 1326) Deaths January 4 – Bernhard von Spanheim, German nobleman January 18 – Maria of Brabant, duchess of Bavaria (b. 1226) January 28 – William II of Holland, king of Germany (b. 1227) February 9 – Alice de Lusigan, English noblewoman (b. 1224) February 16 – Nicola Paglia, Italian Dominican priest (b. 1197) April 12 – Margaret of Bourbon, queen of Navarre (b. 1217) April 23 – Sabrisho V, patriarch of the Church of the East May 1 – Mafalda of Portugal, Spanish abbess and queen May 6