Based on Jones & Mattingly's Atlas of Roman Britain (ISBN 978-1-84217-06700, 1990, reprinted 2007) — the source is cited in the image legend — locations of towns (fortified and unfortified) are given on p. 156 of Atlas of Roman Britain, with tribal civitates and coloniae specified on p. 154. The regional density of villas is taken from p. 241. This page notes villas in southwest Wales (Dyfed), but on p. 254 the discussion says that these are dissimilar to the villas further east (eg, in the Cotswolds); and elsewhere the text suggests that they are 'modernized' homesteads of local type, so the 'few isolated villas', tagged elsewhere with an "I" are here tagged with a "?".
The topographical map is from a sub-region of
File:Uk topo en.jpg, with the copyright notice {{Bild-GFDL-GMT|migration=relicense}} and original date of 7 July 2006, copy made in 2008, with the annotations removed by myself.
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{{Information |Description=Roman Towns and Villas in 4th century Britain |Source=Based on Jones & Mattingly's ''Atlas of Roman Britain'' (ISBN 978-1-84217-06700, 1990, reprinted 2007) and Mattingly's ''An Imperial Possession: Britain in the Roman Empire''
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