Portora Castle was built for Sir William Cole who purchased the land in 1612. It is strategically positioned by the narrow exit of the River Erne into the Lower Lough Erne.
Sir Michael Cole and his family moved to Portora Castle in 1710 when their previous residence, Enniskillen Castle, was hit by fire. They remained there until about 1716, when Sir Michael's son, John Cole (1680–1726), started building Florence Court.
Three of the flankers remain, the two on the west, flanking the walls of the castle. These round towers, about 3m in diameter, have several gun loops. Inside the castle can be seen proper fireplace chimneys in the north and west walls.
The ford at Portora was important in the Erne Waterways and must have seen considerable traffic in peace and war. In the course of the Erne Drainage Scheme (1951–1960) a bronze dirk and stone axes were recovered at this point. The castle is now in ruins, partly because a group of truanting school-boys from nearby Portora Royal School, now Enniskillen Royal Grammar School, experimenting with gunpowder they learnt how to create in chemistry class, blew up a section in the latter part of the 19th century. They also tried digging under the building which added to its dereliction.
References:Château de Niort is a medieval castle in the French town of Niort. It consists of two square towers, linked by a 15th-century building and dominates the Sèvre Niortaise valley.
The two donjons are the only remaining part of the castle. The castle was started by Henry II Plantagenet in the 12th century and completed by Richard the Lionheart. It was defended by a rectangular curtain wall and was damaged during the Wars of Religion. In the 18th century, the castle served as a prison.
The present keeps were the central point of a massive fortress. The southern keep is 28m tall, reinforced with turrets. The northern tower is slightly shorter at 23m. Both are flanked with circular turrets at the corners as well as semicircular buttresses. Each of the towers has a spiral staircase serving the upper floors. The Romanesque architecture is of a high quality with the dressed stones closely jointed.