however, through the exertions of cardinal pierre de foix, an able diplomat and relation of the king’s, an agreement was reached between alfonso and the pope. alfonso then sent a delegation in 1428 (headed by alfonso de borgia, the future callixtus iii), to persuade clement to recognise martin. clement declared his abdication on 26 july 1429 and had his cardinals elect oddo di colonna (martin v) his successor, a formal act precluding future doubts concerning apostolic succession. his abdication was confirmed in mid-august. clement had to make a penitential submission "in forma" to martin v, and when this was done martin granted sanchez muñoz the bishopric of mallorca. sanchez muñoz died on 28 december 1446.