 As the classical period continued, Buddhist philosophizing was concentrated in the monastic communities, especially the huge mountain complexes of Mt Hiei in Kyoto representing Tendai Buddhism and Mt Kōya representing Shingon Buddhism. At first borrowing from Shingon, Tendai soon evolved its own form of esotericism with additional input from emissaries sent to China for further training. Since Tendai was already the most comprehensive form of exoteric teaching in Japan, when mated with esotericism, it became the most inclusive and comprehensive system of philosophy and praxis in the country. As a result, by the end of the classical period the monastic center on Mt Hiei emerged as the premier site of monastic education and philosophical training.