John I of Brabant was a Duke of Brabant who ruled from 1267 until his death in 1294. He was born in 1252 and was the son of Henry III of Brabant and Adelaide of Burgundy. John I is known for his efforts to strengthen the duchy and improve its governance, as well as for his involvement in regional politics. During his reign, John I faced challenges from neighboring territories and worked to maintain peace and stability in Brabant. He was also a patron of the arts and supported the development of cities within his duchy, contributing to the economic growth of the region.