"Philip I, also known as Philip of Saint Pol (25 July 1404 – Leuven, 4 August 1430), was the younger son of Antoine, Duke of Brabant ...
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and Jeanne of Saint-Pol. He succeeded his brother John IV as Duke of Brabant in 1427, while he had inherited Saint-Pol and Ligny as an appanage on the death of his maternal grandfather, Waleran III of Luxembourg, Count of Ligny, in 1415.
He commanded the Burgundian forces occupying Paris in 1419, but he returned to Brabant in 1420, where the populace complained of his brother's misadministration. He was then declared ruwaard (regent) of Brabant. In 1421, he was reconciled with his brother and resigned the regency. The citizens were pacified by John's "Nieuw Regiment" in 1422." - (en.wikipedia.org 11.08.2021)
