Henry Collins Flagg Jr. (January 5, 1792 – March 8, 1863) was an American lawyer, newspaper editor, and politician.
Flagg was born in the parish of St. Thomas, near Charleston, South Carolina on January 5, 1792.
Flagg's father, whose exact name he bore, served through the American Revolutionary War and was a wealthy shipping merchant from Newport, Rhode Island.
Designing to educate his children at the North, he then again took up his residence in New Haven, where his home continued till his death.
[8] Through his daughter Rachel and her first husband Abraham, he was the grandfather of Alice Claypoole Gwynne, who married Cornelius Vanderbilt II in 1867.