
At the bottom of the Mill Hill, facing the Mill, is the former main entrance to Slane Castle.
This, with the crenellated wall leading to a turret at the bridge, was designed by Francis Johnston at the same time as he was building nearby Townley Hall (1794 - 1801).
The coat of arms over the gate is of Sir Henry Conyngham and his wife, Elizabeth Denison.
He inherited the Slane property in 1796 and was created earl the following year.
The arms surmounted by an earl's coronet and below is the Order of St. Patrick, to which he was admitted in 1801.