Lazarraga, member of a family of the lower nobility originating in Oñati, was the Lord of Larrea.
The text, written in the previously unattested Alavese dialect of Basque, is of great importance to philologists and linguists.
He had two children from this marriage: Agustín, who succeeded him as Lord of Larrea, and María, who married Juan Velasco y Galarreta.
It is one of very few Basque-language texts to have survived from the 16th century, and the oldest from the Southern Basque Country.
The first comprises an unfinished pastoral romance, heavily inspired by Jorge de Montemayor's Diana.