of immortality (the Philosopher's Stone). Europe June 15 – Livonian Crusade: Danish Crusaders led by King King Valdemar II (the Victorious), conquer Tallinn in the Battle of Lyndanisse. What is to become the flag of Denmark (Dannebrog) allegedly falls from the sky during that battle. Their stronghold in Tallinn will help the Danes conquer the entirety of Danish Estonia. Twenty-four Lithuanian dukes and nobles purportedly sign a peace treaty with Halych-Volhynia, stating a common cause against invading Christian Crusaders. Asia May 2 – King Leo II (or Levon) of Armenian Cilicia dies, leaving only two daughters. The elder, Stephanie, is the wife of John I; the younger, Isabella, daughter of Princess Sibylla of Cyprus and Jerusalem, is three years old. Leo has promised the succession to his nephew, Raymond-Roupen of Antioch, but on his death-bed he names Isabella as his heir. By topic Technology The windmill is first introduced to China, with the travels of Yelü Chucai to Transoxiana. Mina'i ware pottery production in Persia ceases as a result of the Mongol conquests. Births February 18 – Tettsū Gikai, Japanese Zen Master (d. 1309) April 5 – Wonjong of Goryeo, Korean ruler (d. 1274) Abu al-Abbas al-Mursi, Moorish Sufi leader (d. 1287) Ariq Böke (or Buka), Mongol ruler (khagan) (d. 1266) Baldwin of Avesnes, French nobleman (d. 1295) Christopher I (or Christoffer), king of Denmark (d. 1259) Umiliana de' Cerchi, Italian noblewoman (d. 1246) William Devereux, English nobleman (d. 1265) Deaths February 6 – Robert of Courçon, English cardinal (b. 1160) February 13 – Minamoto no Sanetomo, Japanese shogun (b. 1192) March 17 – Rudolph I, Count Palatine of Tübingen (b. 1160) March 22 – Henryk Kietlicz, archbishop of Gniezno (b. 1150) April 30 – Aldebrandus, bishop of Fossombrone (b. 1119) May 1 – Raoul I of Lusignan, French nobleman and knight May 2 – Leo II (or Levon), king of Armenian Cilicia (b. 1150) May 14 – William Marshal, 1st Earl of Pembroke (b. 1146) June 15 – Theoderich von Treyden, German missionary June 17 – David of Scotland, Scottish nobleman (b 1152) October 29 – Choe Chung-heon, Korean ruler (b. 1149) November 3 – Saer de Quincy, English nobleman (b. 1170) November 5 – Hugh IX (the Brown), French nobleman December 17 – Conon de Béthune, French knight (b. 1150) Casimir II (or Kasimir), duke of Pomerania-Demmin (b. 1180) Gerard de Furnival, Norman nobleman and knight (b. 1175)