There is a sizable community of Black Canadians in Nova Scotia and Southern Ontario who trace their ancestry to African-American slaves who used the Underground Railroad to flee from the United States, seeking refuge and freedom in Canada. From the late 1820s, through the time that the United Kingdom itself forbade slavery in 1833, until the American Civil War began in 1861, the Underground Railroad brought tens of thousands of fugitive slaves to Canada. In 1819, Sir John Robinson, the Attorney-General of Upper Canada, ruled: "Since freedom of the person is the most important civil right protected by the law of England...the negroes are entitled to personal freedom through residence in Upper Canada and any attempt to infringe their rights will be resisted in the courts". After Robinson's ruling in 1819, judges in Upper Canada refused American requests to extradite run-away slaves who reached Upper Canada under the grounds "every man is free who reaches British ground". One song popular with African Americans called the "Song of the Free" had the lyrics: "I'm on my way to Canada, That cold and distant land, The dire effects of slavery, I can no longer stand, Farewell, old master, Don't come after me, I'm on my way to Canada, Where colored men are free!".