Joe Biden’s great-great-grandfather was pardoned by Abraham Lincoln

Joe Biden’s great-great-grandfather was charged with attempted murder after a civil war-era brawl – but pardoned of any wrongdoing by Abraham Lincoln, a newspaper said on Monday, reviving on the US holiday of Presidents’ Day the often contentious issue of presidential powers to grant pardons.

Citing documents from the US national archives, the historian David J Gerleman wrote in the Washington Post that Biden’s paternal forebear Moses J Robinette was pardoned by Lincoln after Robinette got into a fight with a fellow Union army civilian employee, John J Alexander, in Virginia. Robinette drew a knife and sliced Alexander.

The newspaper reported that Robinette worked as an army veterinary surgeon for the army during the US’s war between the states. He was convicted of attempted murder and sentenced to two years hard labor after failing to convince a court he had acted in self-defense.

Three army officers appealed the conviction to Lincoln, arguing it was too harsh. Biden’s long-ago White House predecessor agreed, and Robinette was pardoned on 1 September 1864, seven months before Lincoln was assassinated.

Gerleman wrote that the 22 pages of court martial transcript he found in the national archives helped to “fill in an unknown piece of Biden family history” – on a Presidents’ Day that fell a week after Lincoln’s 12 February birthday, to boot.

The historian said that Robinette’s trial transcript had been “unobtrusively squeezed among many hundreds of other routine court-martial cases” and revealed “the hidden link between the two men – and between two presidents across the centuries”.

Article II, section 2 of the US constitution authorizes American presidents “to grant reprieves and pardons for offenses against the United States,