Around the 15th to 16th centuries, Islam began to spread among the Sundanese people by Indian Muslim traders, and its adoption accelerated after the fall of the Hindu-animist Sunda Kingdom and the establishment of the Islamic Sultanates of Banten and Cirebon in coastal West Java. Numerous ulama (locally known as "kyai") penetrated villages in the mountainous regions of Parahyangan and established mosques and schools (pesantren) and spread the Islamic faith amongst the Sundanese people. Small traditional Sundanese communities retained their indigenous social and belief systems, adopting self-imposed isolation, and refused foreign influences, proselytism and modernisation altogether, such as those of the Baduy (Kanekes) people of inland Lebak Regency. Some Sundanese villages such as those in Cigugur Kuningan retained their Sunda Wiwitan beliefs, while some villages such as Kampung Naga in Tasikmalaya, and Sindang Barang Pasir Eurih in Bogor, although identifying themselves as Muslim, still uphold pre-Islamic traditions and taboos and venerated the "karuhun" (ancestral spirits). Today, most Sundanese are Sunni Muslims.