Baldwin was the son of Baldwin V of Hainaut, and Margaret I, sister of Philip of Alsace and Countess of Flanders.
Baldwin took possession of a much-reduced Flanders, for his uncle had given a large chunk, including Artois, as dowry to Baldwin's sister Isabelle of Hainaut on her marriage to King Philip II of France, and another significant piece to his own wife.
Baldwin's uncle William of Thy (an illegitimate son of Baldwin IV of Hainaut) was regent for Hainaut.
Baldwin was the son of Baldwin V of Hainaut, and Margaret I, sister of Philip of Alsace and Countess of Flanders.
Baldwin took possession of a much-reduced Flanders, for his uncle had given a large chunk, including Artois, as dowry to Baldwin's sister Isabelle of Hainaut on her marriage to King Philip II of France, and another significant piece to his own wife.
Baldwin's uncle William of Thy (an illegitimate son of Baldwin IV of Hainaut) was regent for Hainaut.