 In the year 1778 Bruno Múñoz acquired these lands which were ravaged by bandits. They gave their names to some geographic locations of the department, as Sierra del Avestrús de los ladrones, located between streams Corrales Parao and Otazo.La area between the Arroyo Averías and the river Olimar Grande reportedly the time deposits were up wins the hand of man devouring to make great wine killings. At end of the Great War in the year 1851, Uruguay had been ruined and expansionism Brazilian towards our country increased considerably due to the purchase of land at a low price by its inhabitants, what was attacking until disappear Orientalism, at the hands of l as foreign influences in this case the Brazilian.
 On March 10, 1853, "The Senate and House of Representatives of the Eastern Republic of Uruguay gathered in General Assembly decreed with courage and force of law: Article 1) in the bar or confluence of Yerbal Grande River Olimar, immediately angle formed by the leftist margins of either river, it creates a village to be known as the Treinta y Tres, on a surface area of a square league. " The Executive outlined and distributed sites, as well as responsible for "building a house that will be devoted to public school." The resolution is signed by Giró and Dionisio Coronel, senator for Cerro Largo, who carried out the initiative born of cure Jose Reventós, president of the Society Founding of the People of the Treinta y Tres. He received the name "The Thirty-Three", in tribute to the "Thirty-Three East" in the month of April 1825 and commanded by Juan Antonio Lavalleja landed on the beach of the graceful gesture to begin freeing culminating the Uruguayan independence.
 In 1884 created the department of Treinta y Tres, located between the departments of Cerro Largo and Lavalleja, being the capital village of the same name. The boundaries were formed north Creek Parao until Corner Ramirez and Tacuarí up bar Laguna Merin, on the east bank of the Tacuarí up bar Cebollatí following its course until the brook Corrales, south, the creek Corrales until the headwaters of Cebollatí; bar creek faults and thence following the Olimar Chico to its headwaters in the Cuchilla Grande and west, the Cuchilla Grande in its entirety from the headwaters of the stream Parao.
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