Alcmund of Derby or of Lilleshall, also spelt Ealhmund, Alhmund, Alkmund, or Alchmund (d. c. 800) was son of Alhred of Northumbria. After more than twenty years in exile among the Picts as a result of Northumbrian dynastic struggles, he returned with an army. He was killed in about 800, in some way which is not now clear but for which King Eardwulf of Northumbria was held responsible. Whatever the exact circumstances, his death was regarded as a martyrdom, and Alcmund as a saint.

Alcmund was buried at Lilleshall in Shropshire, where miracles were reported at the tomb. Due to Danish raids, his body was translated to Derby, and St Alkmund's Church and its replacement were dedicated to him. The church was demolished in the 20th century and several earlier churches were revealed stretching back to the 9th century. Artefacts found included the stone sarcophagus.

His feast day is 19 March.

 This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). Catholic Encyclopedia. Robert Appleton Company. 

Derby (ⁱ/ˈdɑːbi/ DAR-bi), is a city and unitary authority in the East Midlands region of England. It lies upon the banks of the River Derwent and is located in the south of the ceremonial county of Derbyshire. In the 2001 census, the population of the city was 233,700, whilst that of the Derby Urban Area was 229,407. According to the 2001 census, Derby was at that time the 18th largest settlement in England, measured by urban area.

The city has Roman, Saxon and Viking origins.

The Roman camp of 'Derventio' was probably at Little Chester/Chester Green (grid reference SK353375); The site of the old Roman fort is at Chester Green. Later the town was one of the 'Five Boroughs' (fortified towns) of the Danelaw.

Djúra-bý, recorded in Anglo-Saxon as Deoraby "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" without reference or proof. However some^[who?] assert that it is a corruption of the original Roman name 'Derventio'. The proven origin of the name "Derby" would seem to be elusive.