What was the nickname of the princess that signed the Lei Áurea law?
Lei Áurea:  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. Isabel, Princess Imperial of Brazil: Dona Isabel (English: Isabella; 29 July 1846 – 14 November 1921), nicknamed "the Redemptress", was the heiress presumptive to the throne of the Empire of Brazil, bearing the title of Princess Imperial.
"the Redemptress"