During Mongkut's reign (1851-1868) the new order also spread into Laos and Cambodia, though it remained a minority sect in comparison to the larger Thai Mahanikaya (which contained over 90 percent of monks). King Mongkut also re-organized and tightened the organization of the sangha by establishing a new administrative system. A 1859 law formulated by Mongkut included eleven articles such as requiring the registration of all monastic residents in royal monasteries. administrative and sangha reforms that Mongkut started were continued by his successor. In 1902 King Chulalongkorn (Rama V, 1868–1910) made the new sangha hierarchy formal and permanent through the Sangha Law of 1902, which remained the foundation of sangha administration throughout the history of modern Thailand (though it was amended numerous times).