Ivangorod Fortress is a Russian medieval castle established by Moscovian Grand Prince Ivan III in 1492 and since then grown into the town of Ivangorod. The castle is strictly quadrilateral with walls 14 meters tall. The original castle was constructed in one summer. Its purpose was to fend off the Livonian Knights. The castle is strictly quadrilateral with walls 14 meters tall.
Ivangorod was won back later in the year by Muscovite forces from the Livonians, under the command of Prince Ivan Gundar and Mikhail Klyapin. Three thousand troops arrived to retake the castle, rebuild it, and construct a new barracks and stronger bastions. For almost 10 years, the land around the castle was in constant warfare. The fortress and the land around changed hands repeatedly. The castle was reconstructed and fortified many times, becoming one of the strongest defensive structures in the 16th century. The castle was in development until the 17th century, becoming a large, sprawling fortress with several lines of defense.
The Treaty of Teusina (1595) returned the fortress to the Russians. In 1612, the Swedes conquered the fortress, which was bravely defended by a voivode, Fyodor Aminev (b 1560s, d 1628) and his sons. By the Treaty of Stolbova, Ingria was ceded to Gustav II Adolf, king of Sweden. In 1704, Peter the Great captured the castle from Swedish troops, bringing the fortress back into Russian control. Inside the fortress, there are two churches: one is dedicated to the Virgin's Assumption (1496) and the other to St. Nicholas (built in the late 16th century but later reconstructed).
After the early 18th century, the military role of the fortress dwindled due to technological advances. In 1728, a review was carried out of the fortresses in this area, which concluded that the installation had been neglected, and had a low fighting efficiency. An order was issued for restoration of Ivangorod fortress, but after the inspection of 1738 the fortress was designated not adequate for defence purpose.
In 1840, some improvements were carried out in the fortress (roofs were changed), further improvements took place in 1863 and 1911-1914. During World War I, the fortress was captured by Germans on 25 February 1918. From 1919 to 1940, the fortress belonged to Estonia. Despite changing hands several times in the first half of the 20th century, the fortress played no significant role in fighting.
During World War II, it was first controlled by the Soviet Union (1940–1941) and then by the Nazi Germany (1941–1944), which established two POW camps within the fortress and left many of its buildings damaged after their retreat. After the annexation of Estonia by the Soviet Union in 1940 Ivangorod fortress was part of the Russian Soviet Republic. The town and fortress remained with Russia after the collapse of the Soviet Union and the restoration of the independent Republic of Estonia in 1990. Currently, the fortress serves as a museum.References:
The Mosque–Cathedral of Córdoba, also known as the Great Mosque of Córdoba and the Mezquita is regarded as one of the most accomplished monuments of Moorish architecture.
According to a traditional account, a small Visigoth church, the Catholic Basilica of Saint Vincent of Lérins, originally stood on the site. In 784 Abd al-Rahman I ordered construction of the Great Mosque, which was considerably expanded by later Muslim rulers. The mosque underwent numerous subsequent changes: Abd al-Rahman II ordered a new minaret, while in 961 Al-Hakam II enlarged the building and enriched the Mihrab. The last of such reforms was carried out by Almanzor in 987. It was connected to the Caliph"s palace by a raised walkway, mosques within the palaces being the tradition for previous Islamic rulers – as well as Christian Kings who built their palaces adjacent to churches. The Mezquita reached its current dimensions in 987 with the completion of the outer naves and courtyard.
In 1236, Córdoba was conquered by King Ferdinand III of Castile, and the centre of the mosque was converted into a Catholic cathedral. Alfonso X oversaw the construction of the Villaviciosa Chapel and the Royal Chapel within the mosque. The kings who followed added further Christian features, such as King Henry II rebuilding the chapel in the 14th century. The minaret of the mosque was also converted to the bell tower of the cathedral. It was adorned with Santiago de Compostela"s captured cathedral bells. Following a windstorm in 1589, the former minaret was further reinforced by encasing it within a new structure.
The most significant alteration was the building of a Renaissance cathedral nave in the middle of the expansive structure. The insertion was constructed by permission of Charles V, king of Castile and Aragon. Artisans and architects continued to add to the existing structure until the late 18th century.
The building"s floor plan is seen to be parallel to some of the earliest mosques built from the very beginning of Islam. It had a rectangular prayer hall with aisles arranged perpendicular to the qibla, the direction towards which Muslims pray. The prayer hall was large and flat, with timber ceilings held up by arches of horseshoe-like appearance.
In planning the mosque, the architects incorporated a number of Roman columns with choice capitals. Some of the columns were already in the Gothic structure; others were sent from various regions of Iberia as presents from the governors of provinces. Ivory, jasper, porphyry, gold, silver, copper, and brass were used in the decorations. Marvellous mosaics and azulejos were designed. Later, the immense temple embodied all the styles of Morisco architecture into one composition.
The building is most notable for its arcaded hypostyle hall, with 856 columns of jasper, onyx, marble, granite and porphyry. These were made from pieces of the Roman temple that had occupied the site previously, as well as other Roman buildings, such as the Mérida amphitheatre. The double arches were an innovation, permitting higher ceilings than would otherwise be possible with relatively low columns. The double arches consist of a lower horseshoe arch and an upper semi-circular arch.