In Brussels he saw `` the things which have been sent to the king from the golden land '' â '' the Aztec treasure that HernÃ n CortÃ s had sent home to Holy Roman Emperor Charles V following the fall of Mexico . There he saw `` the things which have been sent to the king from the golden land '' â '' the Aztec treasure that HernÃ n CortÃ s had sent home to Holy Roman Emperor Charles V following the fall of Mexico .