Nor was this by any means the end of his acquisitions.
Joanna, Duchess of Brabant (1355-1404) in her own right, was aunt on the mother's side to Margaret of Flanders, wife of Philip the Hardy.

Dying without heirs, she bequeathed Brabant, Limburg and Antwerp to her great-nephew, Anthony of Burgundy, younger brother of John the Fearless.
Anthony was killed at Agincourt and was succeeded first by his son John IV, the husband of Jacoba of Holland, and on his death without an heir in 1427, by his second son, Philip of St Pol, who also died childless in 1430.

From him his cousin Philip the Good inherited the duchies of Brabant and Limburg and the marquisate of Antwerp.

Already he had purchased in 1421 the territory of Namur from the last Count John III, who had fallen into heavy debt; and in 1443 he likewise purchased the duchy of Luxemburg from the Duchess Elizabeth of Goerlitz, who had married in second wedlock Anthony, Duke of Brabant, and afterwards John of Bavaria, but who had no children by either of her marriages.

Thus in 1443 Philip had become by one means or another sovereign under various titles of the largest and most important part of the Netherlands, and he increased his influence by securing in 1456 the election of his illegitimate son David, as Bishop of Utrecht.