Born at "Lee Hall" near Hague, Virginia, he was the son of Willoughby Newton and Sarah "Sally" Bland Poythress (1768 – 24 May 1828), the widow of Richard "Squire" Lee and daughter of Peter Poythress (1715–1785) of "Branchester", and Elizabeth Bland (1733–1792).
The couple had eight children; He died at his family's estate, "Linden" in Westmoreland County, Virginia on May 23, 1874, and was interred there in a private cemetery.
Newton received a liberal education from private teachers as a child and went on to attend the College of William and Mary.
He delivered an important and strongly pro-slavery and pro-secession speech before the literary societies of the Virginia Military Institute in 1858.
This article incorporates public domain material from the Biographical Directory of the United States Congress