Background
He was born William Drummond, the youngest son of John Drummond, 2nd Earl of Perth, and Jean Ker, daughter of Robert.
He was born William Drummond, the youngest son of John Drummond, 2nd Earl of Perth, and Jean Ker, daughter of Robert.
Since Robert died in 1650 without a male heir to inherit his titles and estates, these passed to William by special arrangement ratified by Parliament.