John III, Duke of Brabant was a nobleman who ruled from 1355 until his death in 1427. He was born in 1300 and was a member of the House of Reginar. John III is known for his efforts to strengthen the duchy and improve its economy during his reign. He was also involved in various political alliances and conflicts, including his support for the House of Luxembourg. John III's reign contributed to the development of Brabant as an important region in the Low Countries, influencing its culture and governance for years to come.