Premise: The Lei Áurea (] ; English: Golden Law ), adopted on May 13, 1888, was the law that abolished slavery in Brazil. It was signed by Isabel, Princess Imperial of Brazil (1846–1921), an opponent of slavery, who acted as regent to Emperor Dom Pedro II, who was in Europe.
Hypothesis: Golden Law and a princess from brazil helped end slavery. One of them was also a trustee of a Europe emperor.