Immediately on his accession to the throne, Affonso IV., the successor of Dom Diniz, gave full vent to his rage against his half brothers, and with the consent and assistance of the nobility of Portugal, he beheaded João Affonso and confiscated all his lands, as well as those of Affonso Sanches, who had escaped to Castile. This act of revenge, or of justice, as he called it, consummated, he settled down as a worthy successor of his father, and fostered all the schemes of Diniz for the development of Portugal. He also continued his father’s policy of peace with Castile, and made a formal alliance with that country in 1327 when he married his daughter Donna Maria to Alfonso XI. of Castile. This marriage did not prove a happy one; the king neglected his young wife for Leonora de Guzman, and treated her so badly that in 1336 Affonso IV. invaded Castile. A terrible war was impending, when S. Isabel once more played the part of peacemaker. Leaving the convent of Poor Clares at Coimbra, whither she had retired after her husband’s death, she hurried to Estremoz, where the two armies were facing each other, and made peace between the opposing monarchs. Alfonso XI. promised to treat his wife better, and the Infant Dom Pedro, the only surviving son of the King of Portugal, was granted the hand of Constance Manuel, daughter of the Duke of Penafiel. The strength of the new alliance was soon tried; for in 1340 Abu-l-Hasan, king of Morocco, crossed the straits to come to the help of the king of Granada, with a great army. Alfonso XI. sent his wife to beg for the assistance of the Portuguese chivalry, and Affonso willingly complied. In the great battle of the Salado on 29th of October the Moors were utterly defeated, and the two generals who were most conspicuous on the Christian side, were Affonso IV. of Portugal, who won the sobriquet of Affonso “the Brave,” and Don Pedro Fernandez de Castro, Mordomo Mor of Castile. This victory also marks an advance in Portuguese poetry, for on it was written the first Portuguese epic by Affonso Giraldes, the forerunner of Camoens.