But the prudence and governing talents of Maria de Molina, to whom the king had entrusted the regency, met all these difficulties with skill and success. She managed to divide the infantes by conceding to the elder of them, the feeble Henry, a share in the government; by a double marriage she attached the powerful king Diniz of Portugal to the royal house of Castile; to the Aragonese, the protector of the prince de la Cerda, she offered so successful and so obstinate a resistance that the union or _hermandad_ of the estates of his kingdom compelled him to make peace with Castile; she prevailed on the pope to declare her marriage lawful and the king’s birth legitimate, and she won over the estates by lowering the taxes. It is true that fresh troubles afterwards broke out when Ferdinand IV began to reign in his own name (1305); at last, however, by the Treaty of Campillo, the long dispute about the succession was adjusted, and Ferdinand remained in possession of the throne while the princes Ferdinand and Alfonso de la Cerda were indemnified with revenues and feudal lordships. The latter indeed preferred to live as a refugee in Germany, rather than give up the kingly title, but his son, the founder of the ducal house of Medina Sidonia, submitted to the stipulations of Campillo. But Castile had been too long distracted by civil strife, and men’s minds were too much demoralised for peace and tranquillity to return at once without further disturbance. Neither was Ferdinand IV exactly the man to rally the different parties round his throne. His cruelty and the violence of his disposition called forth enmity and hatred and increased the discontent and variance. Jealousy and dissension amongst the grandees were the chief cause why a campaign entered upon in conjunction with the Aragonese king against the emir Mulei Nazar of Granada had no success. On this occasion Ferdinand laid before the pope a complaint against his uncle Don Juan, the soul of all hostile intrigues, charging him with having an understanding with the infidels, and he procured a judicial inquiry, the issue of which he did not, however, live to see.[f] The story of Ferdinand’s death may be told in the following translation from the old Spanish historian Mariana: _Mariana’s Account of the Divine Judgment on Ferdinand IV_ By order of King Ferdinand IV of Castile, two brothers, Pedro and Juan Carvajales, were arrested, being accused of the murder of a nobleman of the house of Benavides, who was killed in Palencia when leaving the royal palace. The identity of the murderer was not ascertained, and many were ill-treated upon suspicion, in particular these two knights, who, after their defence was heard, were condemned for this crime against the king, without a proper trial, although they had not confessed their guilt, a dangerous course to pursue in such cases.