|Northumberland, England, UK|
Aesica (with the modern name of Great Chesters) was a Roman fort, one and a half miles north of the small town of Haltwhistle in Northumberland, England. It was the ninth fort on Hadrian's Wall, between Vercovicium (Housesteads) to the east and Magnis (Carvoran) to the west. Its purpose was to guard the Caw Gap, where the Haltwhistle Burn crosses the Wall. The B6318 Military Road passes about half a mile to the south of the fort.
- " being of the kind of " Æsus
- " association with " Æsus
- " abounding in " Æsus
Æsus is known to have been associated with water and river systems; the name might have been related to a remarkable aqueduct system that drew water from the Haltwhistle Burn – Caw Burn directly into the fort. [f] The main purpose of the fort was to guard the Caw Gap created by the Caw Burn, a tributary of the River South Tyne. [g]
It is believed that the fort was completed in the year 128 AD. Unlike other wall forts that project beyond the Wall, all of Aesica is south of the Wall. The Wall at this point is narrow gauge, but stands next to foundations that were prepared for the broad wall. There was speculation as to why the foundations for the broad wall had not been used to support the wall at this point. In 1939 it was found that Milecastle 43 had already been built in preparation for the broad wall, and it is thought that it was the presence of this milecastle that prevented the north wall of the fort being built on the original foundations. It appears that the milecastle was demolished once the fort had been completed. The east gate and east wall cannot now be traced.
The fort was an oblong, measuring 355 feet (108 m) north to south by 419 feet (128 m) east to west, occupying a comparatively small area of 3 acres (12,000 m2). The north-east corner of the fort is now occupied by farm buildings, built over the route of the Wall.
The fort had only three main gates; south, east and west, with double portals with towers. At some time the west gate was completely blocked up. There were towers at each corner of the fort. The Military Way entered by the east gate and left by the west gate. A branch road from the Stanegate entered by the south gate.
The Vallum passed some short distance south of the fort, and was crossed by a road leading from the south gate to the Stanegate. A vicus lay to the south and east of the fort, and several tombstones have been found there.
The fort was supplied with water by a remarkable aqueduct system that drew water from the Haltwhistle Burn – Caw Burn directly into the fort. The aqueduct wound 6.0 miles (9.7 km) from the head of Caw Burn, north of the Wall, although the direct distance was only about 2.0 miles (3.2 km). [h] [i] [k]
Excavations were carried out in 1894, during which the ramparts were cleared. The west tower of the south gate was found to contain a hoard of jewellery, which included an enamelled brooch shaped as a hare, a gilded bronze brooch described as a masterpiece of Celtic art, a silver collar with a pendant, a gold ring and a bronze ring with a Gnostic gem. During this excavation the headquarters building (principia) was partially uncovered, together with its vaulted underground strong room. A barrack block was also found to the south-west of the principia.
In 1897 a bathhouse was discovered, 100 yards (91 m) to the south, east of the branch road to the Stanegate. It includes a dressing room, latrine, cold room with cold bath, dry-heat room, warm steamy room and hot steamy room.
- Classical References to Aesica 
- See Rudge Cup > Amiens Skillet > . . .bronze bowl found at Amiens, France. . . . . .The inscription on the bowl : MAIS ABALLAVA VXELODVNVM CAMBOG...S BANNA ESICA
- Brittonic Language ( Alan James ) < -ǭg > . . .Adjectival and nominal suffix, indicating ‘being of the kind of’, ‘association with’, ‘abounding in’, the stem-word. It occurs very widely in river-names, hill-names and other topographic names, see CPNS 447-50. . . .
- Brittonic Language ( Alan James ) < -īg, -eg > . . .Early Celtic adjectival suffix *-ico-/ā- > -īg (masculine), -eg (feminine). The sense is similar to that of –ǭg, [c] . . .
- Brittonic Language ( Alan James ) < *Ẹ:s > . . .Early Celtic *ēs- or *ais- > Br *ẹ:s-; Latinised as Esus, Æsus, Hesus. . . .the fort-name Æsica or Esica PNRB p. 242, on Hadrian’s Wall at Great Chesters Ntb, is pretty certainly formed from the Latinised name + the Celtic adjectival suffix –icā- (see –īg) [d] . . .
- See Aesica > Description > Roman aqueduct
- Distance from Aesica to River South Tyne is about 2.0 miles (3.2 km)
- The Greatchesters Bath-house . . .supplied with water via an aqueduct from the headwaters of Caw Burn just over two miles distant from the fort. The aqueduct is in the form of a shallow channel, which winds a tortuous path for over six miles following the contours of the land. . . . 
- Hadrians Wall in the days of the Romans ( Frank Graham ) . . . Dr John Lingard (1771 – 1851) writing in 1807 was the first to notice the remarkable Roman aqueduct to be found here. He mentioned that the "water for the station was brought by a winding aqueduct still visible from the head of Haltwhistle Burn – Caw Burn. It winds down five miles".The aqueduct is actually six miles long but because it was necessary to wind to keep the water flow the direct line is just a little over two miles. Only one bridge was necessary and although it has gone its site is called Banks Bridge today.The aqueduct is marked on the OS map. . . .
- Hadrians Wall in the days of the Romans ( Frank Graham ) . . . Roman aqueduct's are recorded in inscriptions from: 
- Aesica is the only Roman fort on Hadrian's Wall known to have had such a system, although there is evidence to suggest that other forts might have used aqueduct's on a smaller scale. [j]
- James, Alan G. (2019). The Brittonic Language in the Old North, A Guide to the Place-Name Evidence, Volume 2 (PDF). SPNS – The Brittonic Language in the Old North. Scottish Place-Name Society. Retrieved 1 February 2023.
- J. Collingwood Bruce, Roman Wall (1863), Harold Hill & Son, ISBN 0-900463-32-5
- Frank Graham, The Roman Wall, Comprehensive History and Guide (1979), Frank Graham, ISBN 0-85983-140-X