Charles Lennox was further created Duke of Lennox a month later .
The fourth creation of the dukedom of Richmond was in August 1675 , when Charles II granted the title to Charles Lennox , his illegitimate son by Louise de Keroualle , Duchess of Portsmouth .
Charles Lennox was further created Duke of Charles Lennox a month later .
The fourth creation of the dukedom of Richmond was in August 1675 , when Charles II granted the title to Charles Lennox , his illegitimate son by Louise de Keroualle , Duchess of Portsmouth .