Merina people
Islam arrived among the Sakalava people with the Arab traders. It was adopted by the rulers of the Sakalava people in the eighteenth century, in order to gain the military support of the Omani and Zanzibar Sultanates, as the influence of Merina people and the European traders increased. Significant percentage of the Sakalava converted to Islam during the reign of Andriantsoly, while continuing their traditional religious practices such as spirit worship.