John III of Brabant was a Duke of Brabant who ruled from 1355 until his death in 1406. He was born in 1300 and was a member of the House of Reginar. His reign was marked by efforts to strengthen the duchy and improve its economy, as well as navigating the complex political landscape of the Low Countries. John III was known for his diplomatic skills and alliances, particularly through marriage. He was married to Margaret of Male, which helped solidify ties with other noble families. His leadership contributed to the stability and development of Brabant during a time of regional conflict and change.