Another key figure of Bagan Buddhism was the Mon Buddhist monk Shin Uttarajīva. He was a leading religious leader during the reigns of Narathu (1167–1171), Naratheinkha (1171–74) and Narapatisithu (1167–1191). Uttarajiva presided over the realignment of Burmese Buddhism with the Mahavihara school of Sri Lanka, moving away from the Conjeveram-Thaton school of Shin Arahan. Even though the kings supported the reform and sent numerous monks to Sri Lanka to re-ordain, various Burmese monks of the old order (known as the Maramma Sangha) refused to ordain in the new Burmese Sri Lankan based order (the Sinhala Sangha), and this led to a schism. The schism lasted two centuries before the old order finally died out.