214.
*** Froissard, liv.i.chap, 214, 215.
{1366.} As Charles was not able by power to redress so enormous a grievance, he was led by necessity, and by the turn of his character, to correct it by policy, and to contrive some method of discharging into foreign countries this dangerous and intestine evil.
Peter, king of Castile, stigmatized by his contemporaries and by posterity with the epithet of Cruel, had filled with blood and murder his kingdom and his own family; and having incurred the universal hatred of his subjects, he kept from present terror alone, an anxious and precarious possession of the throne.

His nobles fell every day the victims of his severity: he put to death several of his natural brothers, from groundless jealousy: each murder, by multiplying his enemies, became the occasion of fresh barbarities; and as he was not destitute of talents, his neighbors, no less than his own subjects, were alarmed at the progress of his violence and injustice.

The ferocity of his temper, instead of being softened by his strong propensity to love, was rather inflamed by that passion, and took thence new occasion to exert itself.

Instigated by Mary de Padilla, who had acquired the ascendant over him, he threw into prison Blanche de Bourbon, his wife, Bister to the queen of France; and soon after made way by poison for the espousing of his mistress.
Henry, count of Transtamare, his natural brother, seeing the fate of every one who had become obnoxious to this tyrant, took arms against him; but being foiled in the attempt, he sought for refuge in France, where he found the minds of men extremely inflamed against Peter, on account of his murder of the French princess.

He asked permission of Charles to enlist the "companies" in his service, and to lead them into Castile; where, from the concurrence of his own friends, and the enemies of his brother, he had the prospect of certain and immediate success.
The French king, charmed with the project, employed Du Guesclin in negotiating with the leaders of these banditti.