Overlooking the River Boyne, just a few kilometres upstream from Newgrange and the site of the famous Battle of the Boyne, Slane Castle in its existing form was constructed under the direction of William Burton Conyngham, together with his nephew The 1st Marquess Conyngham. The reconstruction dates back to 1785 and is principally the work of James Gandon, James Wyatt and Francis Johnston. Francis Johnston was also the architect responsible for the gothic gates on the Mill Hill, located to the east of the castle.