What was the nickname of the princess that signed the Lei Áurea law?
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. She also served as the Empire's regent on three occasions.
Maria of Montferrat Maria of Montferrat (or Maria of Jerusalem) (1192–1212) was Queen of Jerusalem, the daughter of Isabella I of Jerusalem and Conrad of Montferrat. She was known in her youth as "The Marquise", because of her father's title.