Gillis was the son of Walter II Berthout and Goda of Loon, daughter of
Louis I, Count of Loon. The
Berthout family held lands in
Mechelen, and in the margraviate of Antwerp. Around 1205 he married the Flemish noble widow Catherina of Bailleul, daughter of Gerard, viscount of Oudenburg. They had two sons, Gillis II and Louis, and at least two daughters, Elizabeth and Oda. In 1227 he founded
Rozendaal Abbey for his daughters. On behalf of his wife and step-children, Gillis from 1206 held the hereditary chamberlaincy of Flanders and lordships of
Leffinge,
Lichtervelde, and
Oudenburg. From 1207 he served the interests of
John, King of England, receiving regular payments from him and attending upon his court. He may have fought in the
battle of Bouvines. In 1219 he joined the
Fifth Crusade and took part in the
Siege of Damietta. He was back in Flanders in 1221, and in 1229 joined the
Teutonic Order and turned over his step-children's patrimony to the Teutonic Knights. ==References==