Iscalis was a Roman

Roman Britain

Roman Britain was the part of the island of Great Britain controlled by the Roman Empire from AD 43 until ca. AD 410.The Romans referred to the imperial province as Britannia, which eventually comprised all of the island of Great Britain south of the fluid frontier with Caledonia...

 settlement described by Ptolemy

Ptolemy

Claudius Ptolemy , was a Roman citizen of Egypt who wrote in Greek. He was a mathematician, astronomer, geographer, astrologer, and poet of a single epigram in the Greek Anthology. He lived in Egypt under Roman rule, and is believed to have been born in the town of Ptolemais Hermiou in the...

. The exact location has not been clearly identified but the possible sites are in the modern ceremonial county

Ceremonial counties of England

The ceremonial counties are areas of England to which are appointed a Lord Lieutenant, and are defined by the government as counties and areas for the purposes of the Lieutenancies Act 1997 with reference to the metropolitan and non-metropolitan counties of England and Lieutenancies Act 1997...

 of Somerset

Somerset

The ceremonial and non-metropolitan county of Somerset in South West England borders Bristol and Gloucestershire to the north, Wiltshire to the east, Dorset to the south-east, and Devon to the south-west. It is partly bounded to the north and west by the Bristol Channel and the estuary of the...

, England.

One of the possible sites is at Gatcombe

Gatcombe, Somerset

Gatcombe at Ashton Watering within the civil parish of Long Ashton, Somerset, England is the location of a Grade II* listed building which was built on the site of a Roman settlement....

 which was occupied from the middle of the 1st century until at least the fifth century, demonstrated by the coins of Theodosius

Theodosius I

Theodosius I , also known as Theodosius the Great, was Roman Emperor from 379 to 395. Theodosius was the last emperor to rule over both the eastern and the western halves of the Roman Empire. During his reign, the Goths secured control of Illyricum after the Gothic War, establishing their homeland...

, Magnus Maximus

Magnus Maximus

Magnus Maximus , also known as Maximianus and Macsen Wledig in Welsh, was Western Roman Emperor from 383 to 388. As commander of Britain, he usurped the throne against Emperor Gratian in 383...

 and Arcadius

Arcadius

Arcadius was the Byzantine Emperor from 395 to his death. He was the eldest son of Theodosius I and his first wife Aelia Flaccilla, and brother of the Western Emperor Honorius...

 which have been found. The full extent of the site is unclear, beyond a specific villa but there is some evidence that the site is much more extensive, possibly forming a village or even a town.

The second possible site identified is Charterhouse Roman Town

Charterhouse Roman Town

Charterhouse Roman Town was a town in the Roman province of Britannia. Its site is located just to the west of the village of Charterhouse-on-Mendip in the English county of Somerset....

. The settlement grew up around the north-western edge of prehistoric lead

Lead

Lead is a main-group element in the carbon group with the symbol Pb and atomic number 82. Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals. Metallic lead has a bluish-white color after being freshly cut, but it soon tarnishes to a dull grayish color when exposed...

 and silver

Silver

Silver is a metallic chemical element with the chemical symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it has the highest electrical conductivity of any element and the highest thermal conductivity of any metal...

 mines

Mining

Mining is the extraction of valuable minerals or other geological materials from the earth, from an ore body, vein or seam. The term also includes the removal of soil. Materials recovered by mining include base metals, precious metals, iron, uranium, coal, diamonds, limestone, oil shale, rock...

, which were exploited by the Romans

Roman Empire

The Roman Empire was the post-Republican period of the ancient Roman civilization, characterised by an autocratic form of government and large territorial holdings in Europe and around the Mediterranean....

. Extraction is thought to have begun as early as AD 49. An amphitheatre

Amphitheatre

An amphitheatre is an open-air venue used for entertainment and performances.There are two similar, but distinct, types of structure for which the word "amphitheatre" is used: Ancient Roman amphitheatres were large central performance spaces surrounded by ascending seating, and were commonly used...

 stood west of the settlement. It is the only one in England to exist at a lead mine and is additional evidence of the importance of Mendip lead to the Romans.

Another suggestion is that Iscalis was at the mouth of the River Axe near Bawdrip

Bawdrip

Bawdrip is a village and civil parish in the Sedgemoor district of Somerset, England. The village is on the south side of the Polden Hills about north-east of Bridgwater. According to the 2001 census the parish had a population of 498. The parish includes the hamlets of Bradney and Horsey...

.