The Watergate is the name given to the twin turreted building added to the outer wall of the castle c. 1615. Scottish in style, it was almost certainly built by William Cole, constable of the castle and founder of Enniskillen town. Its name may have come from an earlier gate nearby, marked 'Watergatte' on a map of 1594, which opened on to the water but has long since disappeared. Immediately inside the 'Watergate' is a deep well, an important feature for a castle under attack.
Flag of St George
Flying from the Watergate is the flag of St George, the English national banner until 1606. The long established practice of flying this flag was almost certainly to honour Enniskillen's famous regiment, the Royal Inniskilling Fusiliers. Originally called Tiffin's Regiment after its first colonel, it volunteered along with others to defend Enniskillen from Jacobite forces in 1689. The regiment, according to tradition, fought under this flag and distinguished itself during the Williamite wars, particularly at the Battle of the Boyne. King William is said to have conferred on it the right to use the symbol of a castle flying a St. George flag on its regimental badges and colours.