But what enhanced so much the charm of these accomplishments, was the delightful modesty which enabled him to avoid offence in either act or word to others, for he was deferential to the great men, modest with his equals, and courteous to his inferiors.

These gifts made him beloved, not only by all the Guinigi family, but by all Lucca.

When Castruccio had reached his eighteenth year, the Ghibellines were driven from Pavia by the Guelphs, and Messer Francesco was sent by the Visconti to assist the Ghibellines, and with him went Castruccio, in charge of his forces.
Castruccio gave ample proof of his prudence and courage in this expedition, acquiring greater reputation than any other captain, and his name and fame were known, not only in Pavia, but throughout all Lombardy.
Castruccio, having returned to Lucca in far higher estimation that he left it, did not omit to use all the means in his power to gain as many friends as he could, neglecting none of those arts which are necessary for that purpose.

About this time Messer Francesco died, leaving a son thirteen years of age named Pagolo, and having appointed Castruccio to be his son's tutor and administrator of his estate.

Before he died Francesco called Castruccio to him, and prayed him to show Pagolo that goodwill which he (Francesco) had always shown to HIM, and to render to the son the gratitude which he had not been able to repay to the father.
Upon the death of Francesco, Castruccio became the governor and tutor of Pagolo, which increased enormously his power and position, and created a certain amount of envy against him in Lucca in place of the former universal goodwill, for many men suspected him of harbouring tyrannical intentions.