For a while the attention of that brother was confined at home by the invasion of Conradin, the last heir to the imperial house of Swabia; but the hapless boy sunk in the unequal conflict; and his execution on a public scaffold taught the rivals of Charles to tremble for their heads as well as their dominions.

A second respite was obtained by the last crusade of St.Louis to the African coast; and the double motive of interest and duty urged the king of Naples to assist, with his powers and his presence, the holy enterprise.
The death of St.Louis released him from the importunity of a virtuous censor: the king of Tunis confessed himself the tributary and vassal of the crown of Sicily; and the boldest of the French knights were free to enlist under his banner against the Greek empire.

A treaty and a marriage united his interest with the house of Courtenay; his daughter Beatrice was promised to Philip, son and heir of the emperor Baldwin; a pension of six hundred ounces of gold was allowed for his maintenance; and his generous father distributed among his aliens the kingdoms and provinces of the East, reserving only Constantinople, and one day's journey round the city for the imperial domain.

[38] In this perilous moment, Palaeologus was the most eager to subscribe the creed, and implore the protection, of the Roman pontiff, who assumed, with propriety and weight, the character of an angel of peace, the common father of the Christians.

By his voice, the sword of Charles was chained in the scabbard; and the Greek ambassadors beheld him, in the pope's antechamber, biting his ivory sceptre in a transport of fury, and deeply resenting the refusal to enfranchise and consecrate his arms.