Claudius Ptolemaeus was a celebrated geographer and astrologer who flourished between the reigns of Hadrian and Antonine in the second century AD. A greek by descent, he was a native of Alexandria in Egypt, and became known as the most wise and learned man of his time. He published several books on astronomy, including The Almagest which gave the positions of 1022 fixed stars by latitude and longitude, his discovery of the precession of the equinoxes, and also expounded an Earth-centred view on the workings of the universe based on epicycles - the Ptolemaic System - which was to remain unchallenged until the Polish astronomer Nicolaus Copernicus published his theory on a Sun-centred universe, the now-familiar Solar System, in AD1543.
In addition, the following abbreviations have been adopted throughout the translated text:
| Novantarum Prom. | 21*00 | 61°40 | [== Mull of Galloway, Dumfries & Galloway] |
| ost. ?Abravannus Fl. | 19*20 | 61°00 | [?= Water of Luce, Dumfries & Galloway?] |
| ?Iena Aest. | 19*00 | 60°30 | [?= River Cree, Dumfries & Galloway?] |
| ost. Devas Fl. | 18*00 | 60°00 | [== River Dee, Dumfries & Galloway] |
| ost. Novius Fl. | 18*20 | 59°30 | [== River Nith, Dumfries & Galloway] |
| Ituna Aest. | 18*30 | 58°45 | [== Solway Firth] |
| Moricambe Aest. | 17*30 | 58°20 | [== Morcambe Bay] |
| ?Portus Setantiorum | 17*20 | 57°45 | [?= nr. Fleetwood, Lancashire?] |
| Belisama Aest. | 17*30 | 57°20 | [== River Ribble, Lancashire] |
| Seteia Aest. | 17*00 | 57°00 | [== River Mersey, Merseyside] |
| Caeanganorum Prom. | 15*00 | 57°002 | [?= Ceanganorum Prom. = Point of Ayr, Clwyd (Deceangi)? ?= Ganganorum Prom. = Lleyn Peninsula, Gwynedd (Gangani/Ordovices)?] |
| ost. Toesobis Fl. | 15*40 | 56°20 | [= Tisobis Fl. = Tremadog Bay, Gwynedd] |
| ost. Stuccia Fl. | 15*20 | 55°30 | [= Stuctia Fl. = Afon Ystwyth, Dyfed] |
| ost. ?Tuerobis Fl. | 15*00 | 55°00 | [unknown] |
| Octapitarum Prom. | 14*20 | 54°30 | [== St. David's Head, Dyfed] |
| ost. ?Tobius Fl. | 15*30 | 54°30 | [unknown] |
| ost. ?Ratostabius Fl. | 16*30 | 54°30 | [unknown] |
| Sabrina Aest. | 17*20 | 54°30 | [== River Severn, Gloucestershire] |
| Uxella Aest. | 16*00 | 53°30 | [== River Axe, Somerset] |
| Herculis Prom. | 14*00 | 52°45 | [== Hartland Point, Devon] |
| Antivestaeum sive Bolerium Prom. | 11*30 | 52°30 | [== Land's End, Cornwall] |
| Damnonium sive Ocrium Prom. | 12*00 | 51°30 | [== Lizard Point, Cornwall] |
| After the Tarvedum Prom., or Orcades, by which it is known |
| Virvedrum Prom. | 31*00 | 60°00 | [== Duncansby Head, Scottish Highlands] |
| Verubium Prom. | 30*30 | 59°40 | [== Noss Head, Scottish Highlands] |
| ost. Ila Fl. | 30*00 | 59°40 | [== River Helmsdale, Scottish Highlands] |
| a high shore | 29*00 | 59°40 | [?= Foothills of Beinn Dhorain, Scottish Highlands] |
| Varar Aest. | 28*004 | 59°40 | [== Beauly Firth, Scottish Highlands] |
| ost. Loxa Fl. | 27*30 | 59°40 | [== River Lossie, Grampian] |
| Tuesis Aest. | 27*00 | 59°00 | [== River Spey, Grampian] |
| ost. Caelis Fl. | 27*00 | 58°45 | [== River Deveron, Grampian] |
| Taezalon Prom. | 27*30 | 58°30 | [= Taexalorum Prom. = Kinnaird's Head, Grampian] |
| ost. Deva Fl. | 26*00 | 58°30 | [== River Dee, Grampian] |
| ost. Tina Fl. | 24*00 | 58°30 | [== River Eden, Fife] |
| Boderia Aest. | 22*30 | 59°00 | [= Bodotria Aest. = Firth of Forth] |
| ost. Alaunus Fl. | 21*20 | 58°30 | [== River Aln, Northumberland] |
| ost. Vedra Fl. | 20*10 | 58°30 | [== River Wear, Tyne & Wear] |
| Dunum Sin. | 20*15 | 57°30 | [== Tees bay, Cleveland] |
| ?Gabrantuicorum Sin. with many harbors | 21*00 | 57°00 | [?= Bridlington Bay?] |
| ?Ocelus Prom. | 21*15 | 56°40 | [?= Spurn Head, Humberside?] |
| ost. Abi Fl. | 21*00 | 56°30 | [= Abus Fl. = River Humber, Humberside] |
| Metaris Aest. | 20*30 | 55°40 | [== The Wash] |
| ost. Gariennus Fl. | 20*50 | 55°40 | [= Gariannus Fl. = River Yare, Norfolk] |
| a Promontory | 21*15 | 55°05 | [unknown] |
| ost. ?Sidumanis Fl. | 20*10 | 55°00 | [unknown] |
| Tamesa Aest. | 20*30 | 54°30 | [= Tamesis Aest. = Thames Estuary, Greater London] |
| Next to this the Cantium Prom. | 22*00 | 54°00 | [== South Foreland, Kent] |
| The Novantae dwell on the side toward the north below the peninsula of this name, among whom are the following towns: |
| ?Locopibia | 19*00 | 60°20 | [unknown] |
| ?Rerigonium | 20*10 | 60°40 | [unknown] |
| Below are the Selgovae, among whom are the following towns: |
| ?Carbantorigum | 19*00 | 59°30 | [unknown] |
| ?Uxellum | 18*30 | 59°20 | [unknown] |
| ?Corda | 20*00 | 59°40 | [unknown] |
| Trimontium | 19*00 | 59°00 | [= TRIMONTIVM = Newstead, Borders] |
| From these toward the east, but more northerly, are the Damnoni, among whom are the following towns: |
| ?Colanica | 20*45 | 59°10 | [unknown] |
| ?Vindogara | 21*20 | 60°00 | [unknown] |
| ?Coria | 21*30 | 59°20 | [unknown] |
| ?Alauna | 22*45 | 59°50 | [unknown] |
| ?Lindum | 23*00 | 59°30 | [unknown] |
| ?Victoria | 23*30 | 59°00 | [unknown] |
| Further south are the Otalini5, among whom are the following towns: |
| ?Coria | 20*10 | 59°00 | [?= CORSTOPITVM = Corbridge, Northumberland?] |
| ?Alauna | 23*00 | 58°40 | [?= ALAVNA = Learchild, Northumberland?] |
| Bremenium | 21*00 | 58°45 | [= BREMENIVM = High Rochester, Northumberland] |
| Next to the Damnoni, but more toward the east near the Epidium Prom. are the Epidi and next to these the Cerones; then the Carnonacae, and the Caereni but more toward the east; and in the extreme east dwell the Cornavi; from the Lemannonis Sin. as far as the Varar Aest. are the Caledoni, and above these is the Caledonian forest, from which toward the east are the Decantae, and next to these the Lugi extending to the Cornavi boundary, and above the Lugi are the Smertae; |
| below Caledonia are the Vacomagi, among whom are the following towns: |
| ?Bannatia | 24*00 | 59°30 | [unknown] |
| ?Tamia | 25*00 | 59°20 | [unknown] |
| Pinnata Castra | 27*15 | 59°20 | [= PINNATA CASTRA = Inchtuthill, Tayside] |
| ?Tuesis | 26*45 | 59°10 | [unknown] |
| Below these toward the west are the Venicones, whose town is |
| ?Orrea | 24*00 | 58°45 | [?= HORREA CLASSIS = Carpow, Fife?] |
| More toward the east are the Taezali and the town |
| ?Devana | 26*00 | 59°00 | [?= DEVANA = Aberdeen, Grampian?] |
| Below the Selgovae and Otalini are the Brigantes extending to both seas, among whom are the following towns: |
| Epiacum | 18*30 | 58°30 | [= EPIACVM = Whitley Castle, Northumberland] |
| Vinovium | 17*45 | 58°00 | [= VINOVIVM = Binchester, Durham] |
| Caturactonium | 20*00 | 58°00 | [= CATARACTONIVM = Catterick, North Yorkshire] |
| ?Calatum | 19*00 | 57°45 | [?= CALACVM = Burrow in Lonsdale, Lancashire?] |
| Isurium | 20*00 | 57°40 | [= ISVRIVM = Aldborough, North Yorkshire] |
| ?Rigodunum | 18*00 | 57°30 | [?= RIGODVNVM = Castleshaw, Greater Manchester?] |
| ?Olicana | 19*00 | 57°30 | [?= OLENACVM = Elslack, Lancashire?] |
| Eboracum, Legio VI Victrix | 20*00 | 57°20 | [= EBVRACVM = York, North Yorkshire] |
| ?Camulodunum | 18*00 | 57°45 | [?= CAMBODVNVM = Slack, South Yorkshire?] |
| Near which on the Opportunum Sin. are the Parisi and the town |
| Petuaria | 20*40 | 56°40 | [= PETVARIA = Brough on Humber, Humberside] |
| Below these are the Brigantes but some distance toward the west are the Ordovices, among whom are the towns: |
| Mediolanum | 16*45 | 56°40 | [= MEDIOLANVM = Whitchurch, Shropshire] |
| ?Brannogenium | 16*45 | 56°15 | [?= BRAVONIVM = Leintwardine, Hereford & Worcester?] |
| From these toward the east are the Cornavi, among whom are the towns: |
| Deva, Legio XX Victrix | 17*30 | 56°45 | [= DEVA = Chester, Cheshire] |
| Viroconium | 16*45 | 55°45 | [= VIROCONIVM = Wroxeter, Shropshire] |
| Next to these are the Coritani, among whom are the towns: |
| Lindum | 18*40 | 56°30 | [= LINDVM = Lincoln, Lincolnshire] |
| Ratae | 18*00 | 55°30 | [= RATAE = Leicester, Leicestershire] |
| Next are the Catuvellauni, among whom are the towns: |
| ?Salinae | 20*45 | 55°50 | [unknown] |
| Urolanium | 19*20 | 55°30 | [= VERVLAMIVM = St. Alban's, Hertfordshire] |
| Next to these are the Iceni, whose town is called |
| Venta | 20*30 | 55°20 | [= VENTA = Caistor St. Edmund, Norfolk] |
| Farther eastward and near the Tamesa Aestuarium are the Trinovantes and the town |
| Camulodunum | 21*00 | 55°00 | [= CAMVLODVNVM = Colchester, Essex] |
| Below the peoples we have mentioned, but more toward the west are the Demetae, whose towns are: |
| ?Luentinum | 15*45 | 55°10 | [?= LVENTINVM = Pumsaint, Dyfed] |
| Maridunum | 15*30 | 54°40 | [= MORIDVNVM = Carmarthen, Dyfed] |
| More toward the east are the Silures whose town is |
| ?Bullaeum | 16*50 | 55°00 | [?= BVRRIVM = Usk, Gwent] |
| Next to these are the Dobuni, and their town |
| Corinium | 18*00 | 54°10 | [= CORINIVM = Cirencester, Gloucestershire] |
| then the Atrebati and their town |
| Caleva | 19*00 | 54°15 | [= CALLEVA = Silchester, Hampshire] |
| Next to these, but farther eastward, are the Canti among whom are the towns: |
| Londinium | 20*00 | 54°00 | [= LONDINIVM = London, Greater London] |
| ?Daruernum | 21*00 | 54°00 | [= DVROVERNVM = Canterbury, Kent] |
| Rutupie | 21*45 | 54°00 | [= RVTVPIAE = Richborough, Kent] |
| Below the Atrebati and the Canti are the Regni and the town |
| Noeomagus | 19*45 | 53°05 | [= NOVIOMAGVS = Chichester, Sussex] |
| Below the Dobuni are the Belgae and the towns: |
| ?Iscalis | 16*00 | 53°40 | [?= ISCALIS = nr. Bawdrip, Somerset?] |
| Aquae Calidae | 17*20 | 53°40 | [= AQVAE SVLIS = Bath, Avon] |
| Venta | 18*40 | 53°00 | [= VENTA = Winchester, Hampshire] |
| Toward the west and south of these are the Durotriges whose town is |
| ?Dunium | 18*00 | 52°40 | [?= DVNVM = Hod Hill, Dorset?] |
| Next to these, but more to the west, are the Dumnoni, whose towns are: |
| ?Voliba | 14*45 | 52°00 | [unknown] |
| ?Uxella | 15*00 | 52°45 | [?= VXELIS = Launceston, Cornwall?] |
| ?Tamara | 15*00 | 52°15 | [?= TAMARIS = Plymouth, Devon?] |
| Isca, where is located Legio II Augusta | 17*30 | 52°45 | [= ISCA = Exeter, Devon] |