Rapper Nas is among a list of celebrities whose family tree was traced by Harvard scholar Henry Louis Gates, Jr. for the second season of his PBS series, 'Finding Your Roots.'

The Queensbridge native, who was the first hip-hop artist to be invited on the show, was interested to learn about his African lineage. Admittedly, when Nas found out that his ancestors were sold into slavery, he became angry.

"First I was enraged when I looked at the bill of sale," Nas said at a Television Critics' Association panel about his episode (via Billboard). "I was like, that guy that owned property owes me some cash. My people made him really wealthy, so maybe I should find his family and talk."

While reading more slave documents, Nas also discovered a portrait of their former owner. “This is the face my ancestors looked at everyday,” he pondered. “And now I’m looking into their world.”

When asked if his newfound knowledge of his ancestry will influence his music, Nas said nothing is planned but, "I think in some way it will happen on its own."

Other celebrities taking part in the 10-part PBS series, which tracks down celebrities' ancestry, include Jessica Alba, Stephen King, Derek Jeter, Courtney Vance, Ben Affleck, Anna Deavere Smith and Khandi Alexander.

PBS’ 'Finding Your Roots' will return for a second season on Sept. 23 at 8PM.