Luis Carvajal y de la Cueva, a royal accountant, was a Portuguese New Christian. He received a royal charter from the Spanish Crown to settle Nuevo León, a large expanse of land in the hostile frontier. Because of the dangers and difficulties of this region, Carvajal y de la Cueva received an exemption in his charter from the usual requirement that he prove that all new settlers were "Old Christians" (of at least three generations) rather than recently converted Jews or Muslims. This exemption allowed people to go to Nuevo León who were legally barred from entering New Spain elsewhere. Carvajal was authorized to bring 100 soldiers and 60 laborers to New Spain; many have been documented as Crypto-Jews.