Shlisselburg (originally Schlüsselburg or Nöteborg) was one of the most important medieval fortresses in the northwest Russia. It is located to the head of the Neva River on Lake Ladoga. Today the fortress and the city center are UNESCO World Heritage Sites.
The first fortification was built by Swedes in 1299 but was lost to the Novgorodians in 1301. A wooden fortress named Oreshek was built by Grand Prince Yury of Moscow (in his capacity as Prince of Novgorod) on behalf of the Novgorod Republic in 1323. It guarded the northern approaches to Novgorod and access to the Baltic Sea.
After a series of conflicts, a peace treaty, was signed at Oreshek on August 12, 1323, between Sweden and Grand Prince Yury and the Novgorod Republic which was the first agreement on the border between Eastern and Western Christianity running through present-day Finland. A modern stone monument to the north of the Church of St. John in the fortress commemorates the treaty. Twenty-five years later, King Magnus Eriksson attacked and briefly took the fortress during his crusade in the region (1348–1352). It was largely ruined by the time the Novgorodians retook the fortress in 1351. The fortress was rebuilt in stone in 1352 by Archbishop Vasilii Kalika of Novgorod (1330–1352), who, according to the Novgorod First Chronicle, was sent by the Novgorodians after several Russian and Lithuanian princes ignored the city's pleas to help them rebuild and defend the fort. The remnants of the walls of 1352 were excavated in 1969 and can be seen just north of the Church of St. John in the center of the present fortress.
The fort was captured by Sweden in 1611 during the Ingrian War. As part of the Swedish Empire, the fortress was known as Nöteborg and became the center of the north-Ingrian Nöteborg county. In 1702, during the Great Northern War, the fortress was taken by Russians under Peter the Great in an amphibious assault: 250 Swedish soldiers defended the fort for 10 days before they surrendered. The Russian losses were 6000 men against 110 Swedish losses. It was then given its current name, Shlisselburg, a transcription of Schlüsselburg. The name, meaning "Key-fortress" in German, refers to Peter's perception of the fortress as the "key to Ingria".
During the times of Imperial Russia, the fortress was used as a notorious political prison; among its famous prisoners were Wilhelm Küchelbecker, Mikhail Bakunin and, for 38 years, Walerian Łukasiński. Ivan VI of Russia was murdered in the fortress in 1764, and Lenin's brother, Aleksandr Ulyanov, was hanged there as well.
Out of ten towers, the fortress retains only six (five Russian and one Swedish). The remains of a church inside the fortress were transformed into a memorial to the fortress's defenders. The fortress has been the site of an annual rock concert since 2003. There is also a museum of political prisoners of the Russian Empire, and a small collection of World War II artillery.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.