Cumbernauld House is on the site of what former edifice in the Park in Cumbernauld?
Cumbernauld House:  The house is situated on the site of (former) Cumbernauld Castle, which was besieged by General Monck in 1651. Cumbernauld Castle: Cumbernauld Castle was the predecessor of Cumbernauld House in the Park in Cumbernauld.
Cumbernauld Castle