About 1673, he married a 21-year-old widow named Mary (née Horsmanden) Filmer, a native of Lenham, England.

[1] Mary's father had spent time in Virginia as a Cavalier fleeing Cromwell, and her former husband Samuel Filmer (third son of Tory author Robert Filmer) descended from the sister of Samuel Argall, governor of Virginia.

He also rode with Bacon after the rebellion began and was involved in the sack of Warner Hall, confiscating goods amounting to £845, or the equivalent of what 40 slaves or servants would produce in a year.

[1] In 1688, Theodorick Bland Jr. and his brother Richard conveyed 1,200 acres of their Westover Plantation property to William Byrd I in 1688 for £300 and 10,000 pounds of tobacco and cask.

Byrd died on 4 December 1704, at his plantation home of Westover, in Charles City County, Virginia.