The Moron de la Frontera Castle is located on an elevated hill in the town of Morón de la Frontera, from where the countryside and the southern Sierra Sevillana can be seen.
There also existed Tartessos and Roman settlements, but it was the Arabs who in 711 began to reinforce the remains of the existing Roman and Visigoth walls. In the 10th century when Morón, after the dismemberment of the Caliphate of Córdoba, is converted in the Kingdom of Taifa, and the castle reachs its major prominence. It was then reconquered by King Fernando III “The Saint”. From the middle of the 16th century the castle was inhabited as a habitual residence in turn by the Counts of Ureña, The Dukes of Osuna, etc.
During the XVII and XVIII centuries the castle was practically abandoned, followed by a period of ransacking and destruction ending in 1810.References:
Kristiansten Fortress was built to protect the city against attack from the east. Construction was finished in 1685. General Johan Caspar von Cicignon, who was chief inspector of kuks fortifications, was responsible for the new town plan of Trondheim after the great fire of 18 April 1681. He also made the plans for the construction of Kristiansten Fortress.
The fortress was built during the period from 1682 to 1684 and strengthened to a complete defence fortification in 1691 by building an advanced post Kristiandsands bastion in the east and in 1695 with the now vanished Møllenberg skanse by the river Nidelven. These fortifications were encircled by a continuous palisade and thereby connected to the fortified city. In 1750 the fortress was modernized with new bastions and casemates to protect against mortar artillery.