Question: What was the nickname of the princess that signed the Lei Áurea law?
Context: 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. Brazil's Federal Law 11340, also called Lei Maria da Penha (] , "Maria da Penha Law") was put in place with the intent of reducing domestic violence.  It was sanctioned on August 7, 2006 by the President, Luiz Inácio Lula da Silva (2006-2010).  Among the changes initiated by the law was an increase in punishment for those who practice domestic violence towards women.  The law was put into practice on September 22, 2006; the first offender was arrested in Rio de Janeiro the next day, after trying to strangle his ex-wife. Angolan nationality law is the body of law concerning who is a citizen of Angola.  The basis of Angolan nationality law is "Lei no.13/91 da nacionalidade, de 11 de maio", "Lei no.1/05 da nacionalidade, de 1 de julho", and "Decreto no.31/07 dos registos de nascimentos, de 14 de maio". A Lei niho palaoa is a Hawaiian neck ornament traditionally worn by "aliʻi" (chiefs) of both sexes.  The 19th century examples are most commonly made of a whale tooth carved into a hook-shape suspended by plaited human hair.  The symbolism is not known; it may represent a tongue that speaks the law, or may represent a vessel for "mana" (inherited virtue).  Precontact lei niho palaoa were less than two inches in length, and were not only made of whale ivory, but also of shell, bone, wood, stone, and coral.  Sometimes, several of these smaller pendants were strung on twisted human hair.  The Bishop Museum has a lei niho palaoa with a hair bundle having a circumference of 7.5 inches.  It is made from a single eight-ply square braid cord, measuring 1,708 feet, looped back and forth over 1000 times on each side. Jack Law is the owner of Hula's Bar & Lei Stand in Waikiki.  With a long-standing business history in Hawaii; Law has been coined one of the most influential advocates for gay culture in Honolulu.  While he has helped to create two of Waikiki's famous nightclubs and bars: The Wave Waikiki and Hula's Bar & Lei Stand, he has also founded the Life Foundation and the Rainbow Film Festival, providing the publicized start of Honolulu's Gay and Lesbian culture.  He has previously been appointed by Governors John Waihee and Ben Cayetano to the State of Hawaii Civil Rights Commission where he served for 8 years.  On July 15, 2011 Governor Neil Abercrombie proclaimed “Jack Law Day” giving the bar owner his own day in Hawaii. Lo schiavo ("O escravo" in Portuguese, "The Slave" in English) is an opera  in four acts by the Brazilian composer Carlos Gomes.  The Italian libretto was by Rodolfo Paravicini, after a play by Alfredo Taunay.  The opera deals with the subject of slavery, a major concern in Brazil at the time (the institution had only been abolished by the "Lei Áurea" in 1888). 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. Kaoru Sugayama (菅山かおる , Sugayama Kaoru , born December 26, 1978) is a Japanese volleyball player.  Although her nickname is "yuu", Ai Otomo already had that nickname on the All-Japan women's Team, so she was given the new nickname "kaoru".  Her nickname in television broadcasts is "koushuni kagayaku Kaoru-hime", (攻守に輝くカオル姫, translation: "Princess Kaoru who shines in offense and defense").  Also, she is sometimes known as "shiroi yousei" (白い妖精, translation: "White fairy") due in part to her fair skin.  However, she is embarrassed to be called "Princess Kaoru" or "White fairy".  She belongs to the volleyball team JT Marvelous of the V.League.  In May 2008, she retired from the team and from organized volleyball. Lei Yang () was a Chinese environmentalist who died following an altercation with police in Changping District, Beijing.  Lei was detained on suspicion of soliciting prostitution at a foot parlor.  After being taken to a police vehicle, Lei fell ill and was sent to a hospital, where he died later that night.  The unclear circumstances surrounding his death led to accusations of police brutality, leading law enforcement officials to provide a description of events on state television.  An online petition launched by students of Renmin University, Lei's alma mater, questioned various elements of the police's account, and called for an investigation into his death. The Macau's national security law (, Portuguese: Lei relative à defesa da segurança do Estado) is a law in Macau which prohibits and punishes acts of "treason, secession, and subversion" against the Central government, as well as "preparatory acts" leading to any of the three acts.  Taken into effect on 3 March 2009, the purpose of the law is to fulfil Article 23 of the Macau Basic Law, the constitutional document of the Macau Special Administration Region.
Answer: "the Redemptress"