A study links Professor Gates to a medieval Irish warlord; Peter Gomes' direct paternal line traces back to a Portuguese Jew who escaped the Inquisition.

Morgan Freeman's great-grandmother and her story of slavery.

Morgan Freeman's great-grandmother and her story of slavery; Peter Gomes' ancestors are freed and supported by Quaker families in the late 1700s.

Tom Joyner's great-uncles are executed in 1915 for a crime they may not have committed.

Tom Joyner's great-uncles are executed in 1915 for a crime they may not have committed; Bliss Broyard discovers her father's identity; Chris Rock's great-great-grandfather.

Chris Rock's great-great-grandfather was twice elected to the South Carolina State Legislature; Don Cheadle's great-great-grandparents struggled in Oklahoma.