One day Don Pedro's enemies, at their head his bastard brothers, succeeded in decoying him, with a few of his followers, into the fortress of Toro. His companions, among whom was Samuel Abulafia, were thrown into prison, and the king himself was placed under restraint (1354). Whilst a few of the loyal grandees and even the Grand Master of Calatrava were executed by the conspirators, the favorite Samuel was, strange to say, spared. Later on he succeeded in escaping with the king. Having shared his royal master's misfortune, he rose still higher in his favor, and the esteem in which he was held by the king was largely increased by his successful administration of the finances, which he had managed so as to accumulate a large reserve, of which few of Don Pedro's predecessors had been able to boast. The treacherous seizure of the king at Toro formed a turning point in his reign. Out of it grew a fierce civil war in Castile, which Don Pedro carried on with great cruelty. In this, however, the Jewish courtiers had no hand; even the enemies of the Jews do not charge the Jewish minister with any responsibility for Don Pedro's excesses. The bastard brothers and their adherents endeavored to seize the chief town, Toledo. Here Don Pedro had numerous partisans, amongst them the whole of the Jewish community, and they contested the entrance of the brothers. One of the gates was, however, secretly opened to them by their friends, and they immediately attacked the quarters in which the Jews lived in large numbers. In Alcana street they put to the sword nearly 12,000 people, men and women, old and young. But in the inner town they failed to make any impression, the Jews having barricaded the gates and manned the walls, together with several noblemen belonging to the king's party (May, 1355). A few days later Don Pedro entered Toledo. By his adherents in the city he was received with enthusiasm, but he dealt out severe retribution to all who had assisted his brothers.
Samuel Abulafia, by the wisdom of his counsels, his able financial administration, and his zeal for the cause of Maria de Padilla, continued to rise in the favor of the king. His power was greater than that of the grandees of the realm. His wealth was princely, and eighty black slaves served in his palace. He seems to have lacked the generosity which would have suggested employing some portion of his power and prosperity for the permanent benefit of his race and religion. He certainly "sought to promote the welfare of his people," as an inscription tells us; but he failed to understand in what this welfare consisted. Against injustice and animosity he protected his brethren, promoted a few to state employment, and gave them opportunities for enriching themselves, but he was far from being what Chasdaï Ibn-Shaprut and Samuel Ibn-Nagrela had been to their co-religionists. Samuel Abulafia appears to have had little sympathy with intellectual aspirations, or with the promotion of Jewish science and poetic literature. He built synagogues for several of the Castilian communities, and one of especial magnificence at Toledo, but not a single establishment for the promotion of Talmudic study.