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Jerash (Arabic: جرش‎), known in the Greco-Roman world as Gerasa (Ancient Greek: Γέρασα), is the capital and the largest city of Jerash Governorate, Jordan, with a population of 50,745 as of 2015. It is located 48 kilometres (30 mi) north of the capital of Jordan, Amman.

The history of the city is a blend of the Greco-Roman world of the Mediterranean Basin and the ancient traditions of the Arab Orient. The name of the city reflects this interaction. The earliest Semitic inhabitants, who lived in the area during the pre-classical period of the 1st millennium BCE, named their village Garshu. The Romans later Hellenized the former name of Garshu into Gerasa. Later, the name transformed into the Arabic Jerash.

Hellenistic period
Jerash is the site of the ruins of the Greco-Roman city of Gerasa, also referred to as Antioch on the Golden River. Ancient Greek inscriptions from the city support that the city was founded by Alexander the Great and his general Perdiccas, who allegedly settled aged Macedonian soldiers there during the spring of 331 BC, when he left Egypt and crossed Syria en route to Mesopotamia. However, other sources, namely the city's former name of "Antioch on the Chrysorrhoas, point to a founding by Seleucid King Antioch IV, while still others attribute the founding to Ptolemy II of Egypt.

Roman period
After the Roman conquest in 63 BC, Jerash and the land surrounding it were annexed to the Roman province of Syria, and later joined the Decapolis league of cities. The historian Josephus mentions the city as being principally inhabited by Syrians, and also having a small Jewish community. In AD 106, Jerash was absorbed into the Roman province of Arabia, which included the city of Philadelphia (modern day Amman). The Romans ensured security and peace in this area, which enabled its people to devote their efforts and time to economic development and encouraged civic building activity. Jerash is considered one of the largest and most well-preserved sites of Roman architecture in the world outside Italy. And is sometimes misleadingly referred to as the "Pompeii of the Middle East" or of Asia, referring to its size, extent of excavation and level of preservation. In addition, Jerash was the birthplace of the mathematician Nicomachus of Gerasa (Greek: Νικόμαχος) (c. 60 – c. 120 AD).

In the second half of the 1st century AD, the city of Jerash achieved great prosperity. In AD 106, the Emperor Trajan constructed roads throughout the province, and more trade came to Jerash. The Emperor Hadrian visited Jerash in AD 129–130. The triumphal arch (or Arch of Hadrian) was built to celebrate his visit. ~ wiki

Γαδαρηνῶν = of Gadara

Γερασηνῶν = of Gerasa