The Yemenis are a Muslim and Arabic-speaking people who are mainly Arabs, although a small percentage of the population has African and Asian ancestry. Yemeni values have traditionally relied on a hierarchical, tribally organized, and sex-segregated society. In 1962, following the overthrow of a conservative monarchy that had been supported by members of the Zaydi Islamic sect, the Republic was established, marking Yemen's entry into the modern world. As Muslims, Yemenis aspire to fulfill the five tenets of Islam: affirmation of the Islamic creed, prayer, fasting, charity, and pilgrimage. In the Shafi areas of Yemen, the tombs of certain holy men are visited by believers for their special healing and other powers.