French author of an important 15th-century religious drama known as Mystère de la Passion (1453/54), dramatizing the events of Jesus' life. In 1507 a performance of his Passion play, revised by Jean Michel to 65,000 lines, occupied six days. Gréban also collaborated with his brother Simon on a long mystery play about the Acts of the Apostles. In 1455 he is known to have been organist and choirmaster of Notre-Dame in Paris; he later held a canonry at Le Mans.