The reign of king Borommatrailokkanat (1431–1488) was a golden era for Thai Buddhism. He encouraged the arts and literature as well as built numerous monasteries in Ayudhya. He also ordained as monk for 8 months at Wat Chulamani. During his reign, the Vanaratnavong group also grew in prominence. A major literary work of this era is the "Mahachat Kham Luang" (Thai: มหาชาติคำหลวง). It is an epic poem of the "Great Birth" of Vessantara Bodhisatta which combined Pali verse with Thai poetry.