Itatín
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Itatín (Portuguese: Itatim) was a 17th century region, corresponding to the western half of the 21st century Brazilian state of Mato Grosso do Sul. The indigenous people (Indians or Indios) inhabiting the region gave their name to Itatín. The Itatínes were related to the Guaraní who lived to their south in Paraguay. In 1631, the Jesuit Order of the Roman Catholic church began founding missions in Itatín but the missions failed in 1648 because of slave raids by the Bandeirantes of Brazil and revolts against the Jesuits. Considered part of colonial Paraguay, Itatín was ceded to Brazil in 1750 by the Treaty of Madrid. The name has fallen out of use.