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.
Princess Zorka of Montenegro Princess Ljubica of Montenegro (Serbian: Љубица Петровић-Његош ; 23 December 1864 – 16 March 1890), later Princess Zorka Karađorđević in Serbia. She was better known as Queen Zorka of Serbia.