He was the son of Sir Edward Herbert , second son of William Herbert , 1st Earl of Pembroke and Anne Parr .
The title of Baron Powis was created in the Peerage of England in 1629 for William Herbert .
William Herbert was the William Herbert of Sir Edward Herbert , second son of William Herbert , 1st Earl of Pembroke and Anne Parr .
The title of Baron Powis was created in the Peerage of England in 1629 for William Herbert .