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: Princess Isabel of the Imperial of Brazil, helped to end the slave trade and was alive from the years 1846 to 1919.