Dred Scott, born in Virginia around 1799, was the property of the Peter Blow family. Slave owners Peter and Elizabeth Blow of Virginia brought Scott to St. Louis in 1830.
Scott was bought by Dr. John Emerson, a military surgeon, who later took him to forts in Illinois and the Wisconsin Territory, where slavery was prohibited under the Missouri Compromise. Emerson allowed Dred to marry Harriet Robinson, a slave, and bought her so the two could stay together. In 1842, Emerson and his wife returned to St. Louis.
Dred and Harriet Scott sued for their freedom in 1846, using the argument that they had previously lived in areas where slavery was prohibited by federal law. At the time, slavery was legal in Missouri. Dred Scott won in St. Louis, but the ruling was appealed and overturned by the Supreme Court on March 6, 1857.
Though they lost the Supreme Court case, Dred and Harriet Scott and their two daughters were given their freedom in 1857 by Taylor Blow, a son of the Blows that owned Scott early in his life, quickly after the decision.
Dred Scott died just 18 months later on September 17th, 1858. Taylor Blow saw to Dred Scott's burial in 1858 in the old Wesleyan Cemetery, near South Grand Boulevard and Laclede Avenue, and then had his remains moved to Calvary in 1867 because Wesleyan was being abandoned. Taylor Blow had converted to Catholicism, and the cemetery rule at the time was that whites could bury servants there. At Calvary Cemetery, the back of the tombstone erected in 1957 over Dred Scott's previously unmarked grave says "Freed from slavery by his Friend Taylor Blow."
As a side note... In 1873, Susan Blow founded the nation's first successful public kindergarten at the former Des Peres School in Carondelet. Peter and Elizabeth Blow were Susan Blow's grandparents, and her father was Henry T. Blow, a prominent businessman and namesake of Blow School and Blow Street in Carondelet.
Sources:
Taylor, Betsy. "St. Louis marks 150th anniversary of Dred Scott decision." STLtoday. 6 Mar 2007. ASSOCIATED PRESS. 7 Mar 2007 <http://www.stltoday.com/stltoday/news/stories.nsf/stlouiscitycounty/story/AB81D53E55CC037E862572960078B58C?OpenDocument>.
O'Neil, Tim. "Dred Scott: Heirs to history.." STLtoday. 6 Mar 2007. ST. LOUIS POST-DISPATCH. 7 Mar 2007 <http://www.stltoday.com/stltoday/news/stories.nsf/stlouiscitycounty/story/35EB908B9188CA4286257296000A247A?OpenDocument>.