but John seems to have escaped the same fate. Louis was released in 1252 and moved his army to Jaffa. Louis' constable and chronicler Jean de Joinville portrays John very favourably; he describes John's coat-of-arms as "a fine thing to see...or with a cross pateé gules". John was by now an extremely famous lord in the east, corresponding also with Henry III of England and Pope Innocent IV, who had confirmed Henry I's grant to John. Henry I died in 1253, and Louis IX left for France in 1254, leaving John as bailli of Jerusalem. John made peace with Damascus and used the forces of Jerusalem to attack Ascalon; the Egyptians besieged Jaffa in 1256 in response. John marched out and defeated them, and after this victory he gave up the bailliage to his cousin John of Arsuf. Meanwhile, the Genoese and Venetian trading communities in Acre came into conflict, in the "War of Saint Sabas." John supported the Venetians. In order to bring some order back to the kingdom, John and Bohemund VI of Antioch summoned Dowager Queen Plaisance of Cyprus to take over the regency of the kingdom for the absentee king, Conradin. Nevertheless, the Venetians defeated the Genoese in a naval battle in 1258 and the Genoese left Acre. With Plaisance and Hugh in Acre, the Ibelin family began to decline in importance, but around 1263 John began a scandalous affair with Plaisance, possibly prompting Pope Urban IV to send an official letter in protest, De sinu patris. John's wife and children were believed to have been living apart from him at the time. Maria was visiting her family in Cilicia in 1256 and 1263, and died after visiting her father, Constantine of Baberon, on his own deathbed. John could do little while Baibars, the Mamluk sultan of Egypt, fought with the Mongols in Palestine. Baibars may have reduced Jaffa to vassalage, and certainly used its port to transport food to Egypt. John's truce with Baibars did not last, and he himself died in 1266. By 1268 Baibars had captured Jaffa. Treatise From 1264 to 1266, John of Ibelin wrote an extensive legal treatise, now known as the Livre des Assises, the longest such treatise known from the Levant, dealing with the so-called Assizes of Jerusalem and the procedure of the Haute Cour It also included details about the ecclesiastical and baronial structure of the Kingdom, as