Margaret St. Lawrence (died 1637) (1587–1637) Parents Nicholas St Lawrence, 8th Baron Howth Margaret Barnewall Children Mary Preston Nicholas Preston, 6th Viscount Gormanston Siblings Alison St.Lawrence Christopher St Lawrence, 9th Baron Howth Partners Luke Plunkett, 1st Earl of Fingall Jenico Preston, 5th Viscount Gormanston