The Imperial Arsenal () was the main base and naval shipyard of the Ottoman Empire from the 16th century to the end of the Empire. It was located on the Golden Horn in the Ottoman capital, Constantinople (modern Istanbul).
After the Fall of Constantinople in 1453, Sultan Mehmed II () established an imperial shipyard across the Golden Horn from Constantinople proper, in the formerly Genoese suburb of Galata, probably on the same site as the Genoese vetus tersana ("old shipyard"). Work on the new arsenal was completed under the reign of Mehmed's successor Bayezid II (), but in winter 1513/4 Selim I () began a major expansion, for which 200,000 were allocated by the treasury. In addition to shipyards, covered were built to facilitate maintenance of warships during winter. By 1515, with 160 docks constructed, the Galata arsenal had surpassed Gallipoli, and the main Ottoman naval base was moved there. In the 1526 map of Piri Reis, the arsenal is shown as a continuous line of docks lining the northern shore of the Golden Horn, from the gate of Azab Kapisi to the vicinity of Hasköy. The name " Tershane" was officially applied to the Galata shipyard at about the same time.
In 1546–49, Sokollu Mehmed Pasha built a small stone storehouse, with a flat, lead-covered roof, behind each dock, for the storing of the ship's gear and shipbuilding materials. He also walled off the arsenal grounds from their landward side to conceal its activity from prying eyes. In addition, during this period the arsenal contained a storehouse for oars, the "store of the seventy captains" housing equipment for 70 ships and seven other storehouses, the offices ( divanhane) of the Kapudan Pasha (the fleet's chief admiral), the powder magazine tower, the Sanbola dungeon, the Cirid Meydan pavilion, the gates of Şahkulu and the Meyyit harbour. By 1557, the arsenal counted 123 docks. Following the destruction of the Ottoman fleet in the Battle of Lepanto (1571), the Imperial Arsenal was extensively renovated, with eight new dockyards built inland, surrounding the royal garden ( has bahçe). By the end of the 16th century, two large storehouses had been built: the Kurşunlu storehouse, for shipbuilding and rigging materials and other ship equipment, and a storehouse for timber.
With the introduction of in the late 17th century, and later with steamships and Ironclad warship, this was no longer possible, and the Empire's shipbuilding efforts were concentrated in the Imperial Arsenal at Galata. However, during the 18th century the warships built there were not of high quality, as displayed during the confrontations with the Imperial Russian Navy during the Russo-Turkish War of 1768–74. This resulted in another round of reforms under the Kapudan Pasha Cezayirli Gazi Hasan Pasha, including the establishment of a naval engineering school in 1775/6 ( Hendese Odası, later the Mühendishane-i Bahr-i Hümâyûn). At the same time, French naval experts were called to teach Ottoman shipwrights new techniques: the engineers Le Roi and Durest, and, in 1793, Jacques-Balthazard le Brun, who built several vessels for Sultan Selim III (). In addition, a modern hospital was built within the Arsenal in 1805, followed by the first medical academy ( Tibhane) in 1806. A great dry-dock for the maintenance of modern ships of the line was built in 1797–1800, a second in 1821–25, and a third in 1857–70.]]In 1838, under the auspices of the American Foster Rhodes, the Imperial Arsenal produced its first steamship. By the reign of Abdülmecid I (), the Imperial Arsenal had fallen into neglect and underinvestment; Abdülmecid started a massive investment programme which modernised not just the Imperial Arsenal but also shipyards in Izmit and Gemlik.
During the bombings of Istanbul, the area suffered due to the British planes. The facilities are still in use today and go by the common name "Haliç Shipyards". Camialtı Shipyard, Taşkızak Shipyard and The Haliç Shipyard are three distinct facilities. Only Haliç Shipyard is now in operation out of these three shipyards. Haliç Shipyard is the oldest shipyard in continuous operation in the world.
In the Age of Sail (late 17th–mid-19th centuries), each ship's superintendent, treasurer and scribe were also considered as part of the officer corps, while "captains, mariners, overseers, messengers, shipwrights, caulkers, oar makers, ironsmiths, repairmen, spoolers, towmen, grenade-makers, guards, and retired personnel" comprised the numerous "common folk" of the Arsenal.
As part of Selim III's military reforms, the tersane emini was replaced in 1804 by the Ministry of Naval Affairs ( Umur-ı Bahriye Nezareti), while a modern financial department and treasury were created for the Arsenal in the next year. In 1845, the separate Ministry of the Imperial Arsenal ( Tersane-i Amire Nezareti) was created.
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