The culture of Cambodia has had a rich and varied history dating back many centuries, and has been heavily influenced by India. Throughout Cambodia's long history, a major source of inspiration was from religion. Throughout nearly two millennium, Cambodians developed a unique Khmer belief from the syncreticism of indigenous animistic beliefs and the Indian religions of Buddhism and Hinduism. Indian culture and civilization, including its language and arts reached mainland Southeast Asia around the 1st century AD. It is generally believed that seafaring merchants brought Indian customs and culture to ports along the Gulf of Thailand and the Pacific while trading with China. The first state to benefit from this was Funan. The golden age of Cambodia was between the 9th and 14th century, during the Angkor period, during which it was a powerful and prosperous empire that flourished and dominated almost all of inland south east Asia. However, Angkor would eventually collapse after much in-fighting between royalty and constant warring with its increasingly powerful neighbors, notably Siam and Dai Viet. Many temples from this period however, like Bayon and Angkor Wat still remain today, scattered throughout Thailand, Cambodia, Laos, and Vietnam as a reminder of the grandeur of Khmer arts and culture. Cambodia's unparalleled achievements in art, architectures, music, and dance during this period have had a great influence on many neighboring kingdoms, namely Thailand and Laos. The affect of Angkorian culture can still be seen today in those countries, as they share many close characteristics with current-day Cambodia.