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This specific type of fortification was named after the first discovered example: Trelleborg near Slagelse, excavated in the years 1936-1941.Historically, the name trelleborg has been translated and explained as ″a fortress built by slaves″, since the Old Norse word for slave was thrall (The modern word is træl in Danish and träl in Swedish) and borg means fortress or city.
A fortification (also called a fort, fortress, fastness, or stronghold) is a military construction designed for the defense of territories in warfare, and is used to establish rule in a region during peacetime. The term is derived from Latin fortis ("strong") and facere ("to make"). [1] Castillo San Felipe del Morro, Puerto Rico.
Inside the bailey were stables, workshops, and a chapel. The motte was the final refuge in this type of castle. It was a raised earth mound, and varied considerably, with these mounds being 3 metres to 30 metres in height (10 feet to 100 feet), and from 30 to 90 metres (98 to 295 ft) in diameter. [3] There was a tower on top of the motte.
In the Hellenistic period, the use of ashlar block style masonry developed. Here, blocks were evenly cut small and rectangular, to create the strongest individual block, creating stronger walls and towers. [6] These construction projects were largely financed from public funds, rather than from individual donors as they were a public necessity. [3]
List of the strongholds or dar al-hijra of the Order of Assassins in Persia (Iran) and Syria. Most of the Persian Ismaili castles were in the Alborz mountains, in the regions of Daylaman (particularly, in Alamut and Rudbar; north of modern-day Qazvin ) and Quhistan (south of Khurasan ), as well as in Qumis .
This expansion not only included the creation of the Lion Gate and Postern Gate, but also the inclusion of Grave Circle A within the walls of the citadel. [ 1 ] [ 3 ] The Postern Gate in the back of the citadel was believed to be a back entrance for citizens from the surrounding area to enter in times of attack.
The first examples in England were constructed shortly after the Norman conquest, as strongholds for the occupiers. [1] Their form developed in the 12th century as the military experience gained by the crusaders was introduced into their home residences. The majority of extant examples were built in the 13th century, though a few were built in ...
The Bar-Lev Line evolved from a group of rudimentary fortifications placed along the canal line. In response to Egyptian artillery bombardments during the War of Attrition, Israel developed the fortifications into an elaborate defense system spanning 150 km (93 mi) along Suez Canal, with the exception of the Great Bitter Lake (where a canal crossing was unlikely due to the width of the lake).