Don Guillén was also aware of the situation of Mexico's indigenous. Residing in the viceregal capital, which had the largest concentration of Spaniards in that realm, Don Guillén nonetheless could and did have contact with indigenous in Mexico City. He had become friends with one Don Ignacio, an Indian nobleman of San Martín Acamistlahuacan, via the creole family with whom Don Guillén was living. Don Ignacio was a bilingual Indian (‘’indio ladino’’)in Mexico City to institute a lawsuit against the Spanish official whom the community contended participated in the abuse of Indian laborers in the silver mines of Taxco. Don Guillén helped prepare legal briefs for the lawsuit, which is doubtless how he became familiar with the type and extent of Spanish abuse of Indian labor. Don Guillén discussed his political plans with Don Ignacio. Don Ignacio apparently convinced Don Guillén that Indians in Taxco would be willing to rise in rebellion against the crown due to forced labor. In Don Guillén’s writings, he declares that in fact, New Spain rightfully belongs not to the crown of Spain but to the indigenous, "the kingdom is theirs" and that only they had sovereignty and the right to choose their king. As their king, he would "restore Indians to their liberty and to their ancient laws."