Aaron Burr, the United States vice president who shot dead Alexander Hamilton in a duel, had two children of color with Mary Emmons, an Indian servant from Calcutta.

One of them, abolitionist John “Jean” Pierre Burr, had been buried in an unmarked grave in Eden Cemetery in Collingdale, after being relocated there from Olive Cemetery, a historic African American cemetery, writes Ralph R. Ortega for Dailymail.com.

John Burr died in 1864.

On Saturday, Aug. 24, descendants of both father and son laid a black marble gravestone at John Burr’s burial site in Eden.

‘It was a long time coming. There was never anything marking his grave, not even a wood stake. He was totally unrecognized above ground,’ attorney Stuart Johnson, a descendant of one of the elder Burr’s cousins told DailyMail.com.

The younger Burr had been a barber and abolitionist, who helped slaves escape to freedom on the underground railroad.

The elder Burr was the third US vice president, serving in President Thomas Jefferson’s first term.

The group will now move on to Louisa Charlotte, believed to be the older daughter of Aaron Burr and Mary Emmons.

Read more about John Burr at Eden Cemetery here.

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