For 10 points, name this empire based in Cambodia.
One ruler of this polity ordered the construction of the Bayon Temple, which was famous for its fifty towers.  That man came to power by driving the Champa Kingdom from this polity's former capital, though his son would later make concessions to Champa as well as give up the territory that would be used to found the Sukhothai Kingdom.  This polity's next ruler would pay tribute to Kublai Khan to preserve his rule as well as oversee the destruction of many (*) Buddhist statues in favor of his Hinduism.  That ruler was deposed by his son-in-law, who received the Chinese diplomat Chou Ta-kuan and was named Srindravarman.  Several rulers named Jayavarman and Suryavarman also ruled this kingdom known for constructing the temple complex of Angkor Wat.  For 10 points, name this empire based in Cambodia.
One ruler of this polity ordered the construction of the Bayon Temple, which was famous for its fifty towers.  
{Khmer} Empire