within Senegal. The Halpulaar (Pulaar-speakers), composed of Fula people, a widespread group found along the Sahel from Chad to Senegal, and Toucouleurs, represent 23.8 percent of the population. Historically, they were the first to become Muslim. Many of the Toucouleurs, or sedentary Halpulaar of the Senegal River Valley in the north, converted to Islam around a millennium ago and later contributed to Islam's propagation throughout Senegal. Success was gained among the Wolofs, but repulsed by the Serers. Most communities south of the Senegal River Valley, however, were not thoroughly Islamized. The Serer people stood out as one of this group, who spent over one thousand years resisting Islamization (see Serer history). Although many Serers are Christians or Muslim, their conversion to Islam in particular is very recent and came of free will rather than by force, after forced conversion had been unsuccessfully tried centuries earlier (see Battle of Fandane-Thiouthioune). The spread of formal Quranic school (called daara in Wolof) during the colonial period increased largely through the effort of the Tidjâniyya. In Murid communities, which place more emphasis on the work ethic than on literary Quranic studies, the term daara often applies to work groups devoted to working for a religious leader. Other Islamic groups include the much older Qādiriyya order and the Senegalese Laayeen order, which is prominent among the coastal Lebu. Today, most Senegalese children study at daaras for several years, memorizing as much of the Qur'an as they can. Some of them continue their religious studies at councils (majlis) or at the growing number of private Arabic schools and publicly funded Franco-Arabic schools. Small Catholic communities are mainly found in coastal Serer, Jola, Mankanya and Balant populations, and in eastern Senegal among the Bassari and Coniagui. The Protestant churches are mainly attended by immigrants but during the second half of the 20th century Protestant churches led by Senegalese leaders from different ethnic groups have evolved. In Dakar Catholic and Protestant rites are practiced by the Lebanese, Cape Verdean, European, and American immigrant populations, and among certain Africans of other countries as well as by the Senegalese themselves. Although Islam is Senegal's majority religion, Senegal's first president, Léopold Sédar Senghor, was a Catholic Serer. Serer religion encompasses a belief in a supreme deity called Roog (Koox among the Cangin), Serer cosmogony, cosmology and divination ceremonies such as the annual Xooy (or Khoy) ceremony presided over by the Serer