"Mathas" grew over time, with the most famous and still surviving centers of Vedanta studies being those started by Adi Shankara. Other major and influential "mathas" belong to various schools of Hindu philosophy, such as those of Vaishnavism and Shaivism. The monastery host and feed students, sannyasis (monks, renouncers, ascetics), gurus and are led by "acharyas". These monasteries are sometimes attached to Hindu temples and have their codes of conduct, initiation and election ceremonies. The "mathas" in the Hindu tradition have not been limited to religious studies, and historical evidence suggest that they were centers for diverse studies such as medieval medicine, grammar and music.