 In letters, Alonso de Estrada was sometimes referred to as ""el magnífico señor el thesorero Alonso de Estrada, gobernador de esta Nueva España por sus majestades".His wife Marina de la Caballería would eventually join him in his efforts, in 1523.He arrived to the New Spain in 1523, appointed treasurer of the colony by the Council of the Indies, on the authority of Charles V. His mission was to participate in the government of Cortés and to protect the interests of the Crown.