I also want to help. Do you have a list of leaders?
Wow!! Thanks!!
Here's some more info then on each civ (the leaders of the first three civs are female, the rest male). The city names are the names at the time - we're looking at 1st Century AD for these maps - and the modern names of the cities are in brackets so that you can see them on a map to understand where exactly they are. In some cases, I don't have the ancient names, so the modern ones will have to suffice. I don't expect all the names on the maps, but I've given a few so you can chose what looks best.
Brigantians
Leader: Cartimandua
Capital: Isvrivm Brigantvm (Aldborough, North Yorkshire)
Other cities:
Epiacvm (Whitley Castle, Northumberland)
Vinovia (Binchester, Durham)
Cataractonivm (Catterick, North Yorkshire)
Calacvm (Burrow in Lonsdale, Lancashire)
Isvrivm (Aldborough, North Yorkshire)
Rigodvnvm (Castleshaw, Greater Manchester)
Olenacvm (Elslack, North Yorkshire)
Ebvracvm (York, North Yorkshire)
Cambodvnvm (Slack, West Yorkshire)
Coritani (to be named Corieltauvi)
Leader: Gladys
Capital: Ratae Coritanorvm (Leicester, Leicestershire)
Other cities:
Lindvm (Lincoln, Lincolnshire)
Cavsennae (Ancaster, Lincolnshire)
Ad Pontem (East Stoke, Nottinghamshire)
Danvm (Doncaster, South Yorkshire)
Iceni
Leader: Boudicca
Capital: Venta Icenorvm (Caistor St. Edmund, Norfolk)
Other cities:
Thetford (Norfolk)
Ixworth (Suffolk)
Brettenham (Norfolk)
Toftrees, nr. Fakenham (Norfolk)
Carvetti
Leader: Venutius
Capital: Lvgvvalivm (Carlisle, Cumbria)
Other cities:
Aballava (Burgh by Sands, Cumbria)
Brocavvm (Brougham, Cumbria)
Voreda (Old Penrith, Cumbria)
Magnis Carvetiorvm (Carvoran, Northumberland)
Dobunni
Leader: Bodvoc
Capital: Corinivm Dobvnnorvm (Cirencester, Gloucestershire)
Other cities:
Ariconivm (Weston-under-Penyard, Hereford & Worcester)
Dvrocornovivm (Wanborough, Wiltshire)
Glevvm (Gloucester, Gloucestershire)
Magnis (Kenchester, Hereford & Worcester)
Salinae (Droitwich Spa, Hereford & Worcester)
Vertis (Worcester, Hereford & Worcester)
Dumnonii
Leader: Togodumnus
Capital: Isca Dvmnoniorvm (Exeter, Devon)
Other cities:
Voliba Currently unidentified. Fancifully associated with Golden, near Probus in Cornwall.
Uxella (Launceston, Cornwall)
Tamara (Plymouth, Devon)
Nemetostatio (North Tawton, Devon)
Dvrocornavivm
Ictis (St. Michael's Mount, Cornwall)
Statio Deventiasteno (Nanstallon, Cornwall)
Atrebates
Leader: Verica
Capital: Calleva Atrebatvm (Silchester, Hampshire)
Other cities:
Cvnetio (Mildenhall, Wiltshire)
Thatcham (Berkshire)
Guildford (Surrey) Spinis near Lambourne, Berkshire)
Belgae
Leader: Diviciacus
Capital: Venta Belgarvm (Winchester, Hampshire)
Other cities:
Iscalis The identification of this place remains uncertain, but Ptolemy places it at the mouth of the River Axe near Bawdrip in Somerset.
Aqvae Calidae (Bath, Avon)
Sorviodvnvm (Old Sarum, nr. Salisbury, Wiltshire)
Cantiaci
Leader: Adminius
Capital: Dvrovernvm Cantiacorvm (Canterbury, Kent)
Other cities:
Londinivm (London, Greater London)
Rvtvpiae (Richborough, Kent)
Dvrobrivae (Rochester, Kent)
Maidstone (Kent)
Parisi
Leader: Dumnocoveros
Capital: Petvaria (Brough-on-Humber, Humberside)
Other cities:
North Ferriby - near Brough
Derventio (Malton, North Yorkshire)
Delgovicia (Millington, Humberside)
Rudston (Humberside)
East Knapton