From Brittanica dot com: Arnoul Gréban (born 1420, probably Le Mans, Anjou, Fr.—died 1471, probably Le Mans) was a 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 https://www.goodreads.com/author/show... 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.

From Wikipedia: Arnoul Gréban (Le Mans before 1420 – Florence ca. 1485), a French organist at the Cathedrale Notre Dame de Paris, authored a Mystère de la Passion and with his brother Simon Gréban the Mystère des Actes des Apôtres.

Gréban may have come from the diocese of Cambrai; he lived in France and Italy. He was Master of Arts, bachelor of theology in 1458; from 1451 to 1456, he was organist and master of grammar and maître des enfants [fr] at the choir of Notre-Dame-de-Paris. He then served Charles, Count of Maine, until the death of the latter in 1472. He then left to Italy, was chaplain of San Lorenzo in Florence in 1476 and responsible for music at the House of Medici until 1485.