In 1534 he obtained the rights of a capitulación de conquista [es] south of the Straits of Magellan.

He was appointed by Charles V, Holy Roman Emperor as an adelantado of the Governorate of Terra Australis in 1539.

[3] After some financial success, he returned to Spain and was granted leave by Emperor Charles V to return to the New World where he conflicted with rival conquistador Pedro de Valdivia over different grants to lands south of Peru.

[4] According to Argentina and Chile the capitulación granted to Sánchez de la Hoz proves the Spanish Empire had claims and an animus occupandi on the lands that would later be called Antarctica.

Given that Chile and Argentina have historically successfully established their border based on the uti possidetis iuris principle of international law the Sánchez de la Hoz grant forms part of their arguments for territorial claims in Antarctica.