 Magnus Gabriel's mother was Ebba Brahe, daughter of Lord High Steward Magnus Brahe and Brita Leijonhufvud.Ebba had a relationship with young King Gustavus Adolphus, probably during the years 1613–1615.Gustavus's mother, Christina of Holstein-Gottorp, ruined her son's wish to marry Ebba Brahe, who in 1618 instead married Jacob De la Gardie.