The Teyy people used to inhabit the current departments of Misiones and Paraguari.

[2] According to her 1779 will, Juana Ortiz de Zarate, mestiza daughter of Spanish conquistador and governor Juan Ortiz de Zarate was mentioned as a resident in a estate located in the Partido of Ybytymini.

By that time the area of Ybytymini comprised the current territory of Tebicuary as well as of neighnoring district Ybytymi.

Juana had acquired the estate from a royal ensign named Juan Bautista Achard.

In 1785, Spanish traveller Felix de Azara described Ybytymini as "of broad extension" and with a population of 600 people and with crops like sugarcane, tobacco and yucca.