Final answer:
Slavery ended in Brazil in 1888 under the reign of Emperor Pedro II. The complete abolition was marked by the signing of the Lei Áurea by Princess Isabel, regent of Emperor Pedro II.
Step-by-step explanation:
Slavery ended in Brazil in 1888, which was during the reign of Emperor Pedro II. Despite various laws that were passed to weaken the institution of slavery, such as the 1871 law that freed children born to enslaved women, and the 1885 law that granted freedom to enslaved people upon reaching sixty years of age, it wasn't until May 13, 1888, that Brazil completely abolished slavery with the signing of the Lei Áurea, or Golden Law, by Princess Isabel, regent of Emperor Pedro II. Emperor Pedro II himself was a proponent of the abolitionist movement and his long reign saw the eventual end to slavery in Brazil.