Gilberto Freyre noted the major differences between these groups. Some Sudanese peoples, such as Hausa, Fula and others, were Islamic and spoke Arabic and many of them could read and write in this language. Among Muslim slaves were brought from northern Mozambique. Freyre noted that many slaves were better educated than their masters, because many Muslim slaves were literate in Arabic, while many Portuguese Brazilian masters could not read or write in Portuguese. These slaves of greater Arab and Berber influence were largely sent to Bahia. These Muslim slaves, known as "Malê" in Brazil, produced one of the greatest slave revolts in the Americas, known as the Malê Revolt, when in 1835 they tried to take control of Salvador, until then the largest city of the American continent, and all of the New World.