Capitulation of Alzira before Jaume I Historical milestone · Alzira, La Ribera Alta, Valencia Image of Alzira, not of the place itself. The Islamic town of al-Yazira, set on an island in the Xúquer, capitulated on 30 December 1242. It controlled the only reliable crossing of the river and that is why the king said on taking it that with it he closed and opened the kingdom, as the chronicles record. 1242 Photo: Espencat (Public domain) What to see and do in Alzira