It produced a trilingual catechism (then known as "Catechism of St. Toribius"), in Spanish, Quechua and Aymara. This catechism was later translated into the Guaraní language by Luis de Bolaños, and adopted by the First Synod of Asunción (1603) for use in the area of the Upper Paraná River basin (eastern Brazil, Paraguay and northeastern Argentina).
The catechism, originally known as "Catechism of St. Toribius," was created in Spanish, Quechua, and Aymara to be used in the Upper Paraná River basin (eastern Brazil, Paraguay, and northeastern Argentina) at the First Synod of Asunción (1603). It was later translated into Guaraní by Luis de Bolaños.