ヤコブス・デ・ウォラギネ
The poem recounts the story of the patriarch Joseph, one of the twelve sons of Jacob, not as recorded in the Old Testament but rather in the Islamic tradition. Its content reflects a commentary on Sūrat Yūsuf—the twelfth sūrah of the Qur'an—and Golden Legend by Jacobus de Voragine and the Sēfer ha-Yāšār—a Hebrew midrash and collection of legends.