The name "Derwent" is Celtic and means "a valley thick with oaks". These areas of land were known as Norþworþig ("Northworthy", = "north enclosure") and Deoraby, and were at the "Irongate" (north) side of Derby.
Modern research (2004) into the history and archaeology of Derby has provided evidence that the Vikings and Anglo-Saxons probably co-existed, occupying two areas of land surrounded by water. During the Civil War of 1642–1646, Derby was garrisoned by Parliamentary troops commanded by Sir John Gell, 1st Baronet, who was appointed Governor of Derby in 1643.
Derby is an internationally renowned centre for advanced transport manufacturing, home to the world’s second largest aero-engine manufacturer, Rolls-Royce, and Derby Litchurch Lane Works, for many years the UK's only train manufacturer.
Toyota Manufacturing UK's automobile headquarters is south west of the city at Burnaston. Later the town was one of the 'Five Boroughs' (fortified towns) of the Danelaw, until it was captured by Lady Aethelflaed of Mercia in July 917, subsequent to which the town was annexed into the Kingdom of Mercia.
The Viking name Djúra-bý, recorded in Old English as Deoraby, means "Village of the Deer".
This popular belief is asserted by Tim Lambert who states, "The name Derby is derived from the Danish words deor by meaning deer settlement." However the origin of the name "Derby" would seem to be elusive: some assert that it is a corruption of the original Roman name 'Derventio' and others that the name could be linked with the river which flows through it, the Derwent, in that Derby could be a shortened version of Derwent by, meaning "Derwent settlement".
) is a city in Derbyshire, England, on the banks of the River Derwent. Derby was settled by Romans – who established the town of Derventio – Saxons and Vikings, who made Derby one of the Five Boroughs of the Danelaw.
Initially a market town, Derby grew rapidly in the industrial era.
Home to Lombe's Mill, an early British factory, Derby has a claim to be one of the birthplaces of the Industrial Revolution.
With the arrival of the railways in the 19th century, the city became a centre of the British rail industry.
The prince called at The George Inn on Irongate, where the Duke of Devonshire had set up his headquarters, and demanded billets for his 9,000 troops.
He stayed at Exeter House, Full Street where he held his "council of war".
A replica of the room is on display at Derby Museum in the city centre.