When in 1401 he was restored, he delegated his authority in the province, where he was still hated, to Bernard d'Armagnac. In 1396 he negotiated a truce with Richard II.
It was Puylaurens who arranged the escape of Gaston to Brussels in 1632 after the capture of Henri, duc de Montmorency, and then negotiated his return with Richelieu, on condition that he should be reconciled to the king.
In 1617 the Dutch negotiated with the Iroquois a treaty of peace and alliance.
He displayed administrative ability and great loyalty to the central government as intendant in Guienne in 1627, and in 1628 negotiated the boundary delimitation with Spain.
He negotiated an alliance with Parma, Romagna and Tuscany, when other provisional governments had been established, and entrusted the task of organizing an army for this central Italian league to General Fanti.
