Born in the town of Olinda circa 1555, Duarte Gomes da Silveira reached adulthood when the captaincy of Pernambuco served as a core space for the expansion and conquest of the other Northern Captaincies of Brazil. Assuming a prominent position in the war against the Potiguara – an episode that marks the beginning of the process of conquest of the captaincy of Paraíba –, Gomes da Silveira was rewarded with lands and other assets that would later become part of the morgado of Salvador do Mundo (MELLO, 2021, p. 15). Throughout his life, Gomes da Silveira managed to establish prosperous sugar mills “worth more than a thousand cruzados” (SEIXAS, 1987, p. 214), thus becoming one of the richest landowners of this captaincy in the early 17th century. While running his sugar mills, Gomes da Silveira held several positions in Paraíba’s local governance, before, during and after the Dutch invasion, and orchestrated the restoration of the captaincy to Portuguese sovereignty (GONÇALVES, 2007). His interventive role in Paraiba’s local society was also consolidated by sponsoring the foundation of the Santa Casa da Misericórdia of Paraíba, in which church he established the chapel of the Salvador do Mundo to which several houses and lands, in addition to his mills of Nossa Senhora da Ajuda e Santo António (“with all slaves of Guinea and the native ones”, that is, Africans and Amerindians) were entailed. This newfound morgado of Salvador do Mundo stands out for having been established still during the Dutch occupation of the Northern Captaincies (1630-1654), in the presence of a Portuguese notary, which suggests a certain recognition of the institutions as well as the Portuguese normative order by the Dutch. Following the death of his firstborn son, João Gomes da Silveira Bezerra, mentioned in the initial attempt to institute the morgado, the appointment of the heirs resided in favor of his nephew António Barbalho and his wife Joana Gomes da Silveira Bezerra, daughter of the founder. This couple became, the first administrators of a lineage where birthright determined the hereditary transmission of entailment administration, following the common practice adopted by entailments in general, which only admitted bastards in a situation of lineage extinction.