Buddhism in Cambodia or Khmer Buddhism () has existed since at least the 5th century. In its earliest form it was a type of Mahāyāna Buddhism. Today, the predominant form of Buddhism in Cambodia is Theravada Buddhism. It is enshrined in the Cambodian constitution as the official religion of the country. Theravada Buddhism has been the Cambodian state religion since the 13th century (except during the Khmer Rouge period). it was estimated that 97.9 percent of the population are Buddhists. The history of Buddhism in Cambodia spans a number of successive kingdoms and empires. Buddhism entered Cambodia via two different streams. The earliest forms of Buddhism, along with Hindu influences, entered the Kingdom of Funan with Hindu merchants. In later history, a second stream of Buddhism entered Khmer culture during the Angkor empire when Cambodia absorbed the various Buddhist traditions of the Mon kingdoms of Dvaravati and Haripunchai. For the first thousand years of Khmer history, Cambodia was ruled by a series of Hindu kings with an occasional Buddhist king, such as Jayavarman I of Funan, Jayavarman VII, who became a mahayanist, and Suryavarman I. A variety of Buddhist traditions co-existed peacefully throughout Cambodian lands, under the tolerant auspices of Hindu kings and the neighboring Mon-Theravada kingdoms. History Possible early missions Unconfirmed Sinhalese sources assert that missionaries of King Ashoka, introduced Buddhism into Southeast Asia, approximately in the 3rd century BC. Various Buddhist sects competed with Brahmanism and indigenous animistic religions over approximately the next millennium; during this period, Indian culture was highly influential. Funan The Funan Kingdom that flourished between 100 BC and 500 CE was Hindu, with the kings of Funan sponsoring the worship of Vishnu and Shiva. Buddhism was already present in Funan as a secondary religion in this era. Buddhism began to assert its presence from about year 450 onward, and was observed by the Chinese traveler Yijing toward the close of the seventh century. Two Buddhist monks from Funan, named Mandrasena and Saṃghabara, took up residency in China in the 5th to 6th centuries, and translated several Buddhist sūtras from Sanskrit into Chinese. Among these texts is the Mahāyāna Mahāprajñāpāramitā Mañjuśrīparivarta Sūtra. This text was separately translated by both monks. The bodhisattva Mañjuśrī is a prominent figure in this text. Chenla The Kingdom of Chenla replaced Funan and endured from 500–700. Buddhism was weakened in the Chenla period, but survived, as seen in the inscriptions