Another large religion in Cuba is Santería. Santería is a blend of Catholicism and traditional Yoruba religions. When African slaves first arrived in Cuba during the 16th century, they were taught a few simple prayers and were baptised by the Spanish. The slaves combined this limited form of Catholicism with their traditional religions to create Santería, which survives to this day. During colonial times and into the early Republic, many Cubans suffered from intense ethnocentrism and confused Afro-Cuban religion with black magic and witchcraft. This caused them to associate practitioners of Santería and other Afro-Cuban cultures with criminals and the underworld, and to discriminate against practitioners without understanding the nature of their religion. Because most practitioners of Santería in those years were of African heritage, racist attitudes emerged around the religion, and many whites in Cuba considered it to be subversive and threatening. Those who practiced Santería often resorted to secrecy as a way to avoid persecution. Fernando Ortiz, Lydia Cabrera, and Rómulo Lachatañeré are considered the founders of Afro-Cuban studies in Cuba and were the first to give scholarly attention to Santería as an important religion in Cuba.