The Celts did not reign over one specific area. There were many types in many countries of Western Europe. They inhabited much of Europe and Asia minor during pre-Roman times, their culture having developed during the late Bronze age around the upper Danube Region. They reached their height during the 5th through the 1st Century b.c.
For your own personal research pleasure, you may want to consider the following publications:
The Spirit of the Celtic Gods and Goddesses
Celtic Mythology- Tales of Gods, Goddesses and Heroes
Celtic Mythology: A Complete Guide to Celtic Mythology, Celtic Gods and Celtic Folklore
We have collected these publications and made them available in the Visual Adjectives Bookstore.
You can find them at https://www.visualadjectives.com/blank-2
The pantheons of Gods were many and large. So these rather lengthy lists will be done by area.
Gaulish and Brythonic Deities: Gaul occupied the areas of modern day France, Luxembourg, Belgium, Northern Italy and Germany along the West of the Rhine River as well as parts of the Netherlands. Brythonic pertains to ancient languages of Britain : Welsh, Cornish and Breton, as opposed to Anglo-Saxon or Gaelic.
Male
Abandinus- Possibly a River god.
Abellio- (Abelio, Abelionni) - A god of Apple Trees
Alaunus (Fin)- God of healing and prophecy
Alisanos - Alisaunus
Ambisagrus- A god of thunder and lightning, Ancestor God, Sky God, God of wind, rain and hail.
Anextiomarus - (Anextlomarus, Anextlomara) A protector God.
Ankou- A god of death.
Atepomarus- A horse god.
Arvernus- A tribal god.
Arausio- A god of water.
Barinthus- (Manannan mac Lir)- A god of the sea and water.
Belatucadros- A god of war.
Belenus- A god of healing.
Borvo- (Bormo, Bormanus)- A god of mineral and hot springs.
Borrum- A god of the winds.
Buxenus- A god of box trees.
Camulus- (Camulus, Camalos)- A god of war and sky.
Canetonnessis
Cernunnos
Cicolluis- God of the Celtic Army.
Cimbrianus
Cissonius-(Cisonuis, Cesonius) A god of trade.
Mars Cnabetius- A god of war.
Cocidius- A god of war.
Condatis- A god of the confluences of Rivers.
Contrebis- (Contrebis, Cesonis)- A god of a city.
Dii Casses- God of refuse.
Dis Pater- (Dispater) A god of the underworld.
Esus- (Hesus)
Fagus- A god of Beech trees.
Genii Cucullati- Hooded spirits
Grannus- A god of healing and mineral springs.
Intarabus
Iovantucarus- A protector of youth.
Latobious
Lenus- A healing god.
Leucetios- (Leucetius)- A god of thunder.
Lugus- A god of Creation and Learning.
Luxovius- (Luxovius) A god of a city's water.
Mapanos- (Maponus)- A god of youth.
Mogons- (Moguns)
Moritasgus- A healing Badger gos.
Mullo
Nemausus- A god worshiped at Nimes.
Nerius
Nodens- (Nudens, Nodons)- A god of healing, the sea, hunting and dogs.
Ogmios
Robor- A god of oak trees.
Rudianos- A god of war.
Sedatus
Segomo- A god of war.
Smertrios- (Smertios, Smertrius) A god of war.
Secullos- (Sucellus, Sucellos)- A god of love and time.
Taranis- A god of thunder.
Toutatis- (Caturix, Teutates)- A tribal god.
Tridamos- A god of bovine triplication and abundance.
Veteris- (Vitiris, Vheteris, Huetiris, Hueteris)
Virotutis
Visucius
Vindonnus- A god of hunting and healing
Vinotonus
Vosegus- A god of the Vosges Mountains.
Female:
Abnoba- A goddess of rivers and forests
Adsullata- A goddess of the River Savubalada
Aericura
Agrona- A goddess of war.
Ancamna- A water goddess.
Ancasta- A goddess of the River Itchen
Andarta- A goddess of war.
Andraste- A goddess of victory.
Arduinna- The goddess of the Ardennes Forest.
Aufaniae
Arnemetia- A water goddess.
Artio- Goddess of the bear.
Aventia
Aveta- A mother goddess, associated with the fresh-water spring at Trier, in what is now Germany.
Belisama- A goddess of lakes and rivers, fire, crafts and light. Consort of the god Belenus.
Brigtania
Britannia- Originally a personification of the island of the same name, later made into a goddess.
Campestres
Clota- A patron goddess of the River Clyde.
Coventina- A goddess of wells and springs.
Damara- A fertility goddess
Damona- Consort of Apollo Borvo and of Apollo Moritasgus.
Dea Matrona- A "Divine mother goddess" and goddess of the River Marne in Gaul.
Dea Sequana- Goddess of the River Seine.
Debruanua- A goddess of speed and fat.
Epona- A fertility goddess, protector of donkeys, horses and mules.
Ercura- An earth goddess
Icaunus- A goddess of a river.
Icovellauna- A watergoddess
Litavis
Mairiae
Nantosuelta- A goddess of Nature, the earth, fire and fertility in Gaul.
Nemetona
Ritona- (Pritona)- A goddess of fords
Rosmerta- A goddess of fertility and abundance.
Sabrina- Goddess of the river Severn
Senua
Sequana- Goddess of the River Siene
Sirona- A goddess of healing and fertilty.
Suleviae- A triune version of Sulis.
Sulis- A solar-nourishing, life-giving goddess and an agent of curses.
Tamesisaddas- Goddess of the River Thames.
Verbeia- Goddess of the River Wharfe.
2. Welsh Deities
Male
Aeron- God of war.
Amaethon- God of agriculture.
Arawn- King of the Underworld realm of Annwn.
Afallach- Decendant of Beli Mawr and father of Mabon ap Modron.
Beli Mawr- Ancestor god.
Bendigeirdran- Giant and king of Britain
Culhwch
Dwyfan
Dylan Ail Don
Euroswdd
Gofannon
Gwydion
Gwyddno Garanhir
Gwyn ap Nudd
Hafgan
Lleu Llaw Gyffes
Lludd Llaw Eraint
Llyr
Mabon
Manawydan
Math Fab Mathonwy
Myrddin Wyllt
Nisien and Efnysien (twin brothers)
Pryderi
Pwyll
Taliesin
Ysbaddaden
Female-
Arianrhod
Blodeuwedd
Branwen
Ceridwen
Cigfa
Creiddylad
Cyhyraeth
Don
Elen
Habondia
Modron- Welsh Derivation of Dea Matrona, a possible prototype for Morgan Le Fay.
Olwen
Penarddun
Rhiannon
3. Gaelic Deities from the areas of either Ireland or Scotland.
Male-
Abarta
Abcan
Abean (Abhean)
Aed (Aodh)
Aengus aka Oengus (Aonghus)
Ailill
Alastir
Ai (Aoi)
Balor
Bodb Dearg (Bodhbh Dearg)
Brea
Bres (Breas)
Brian, Iuchar and Iucharba
Buarainech
Cian
Cichol aka Ciocal
Conand (Conann)
Corb
Credne (Creidhne)
Crom Cruarch
Crom Dubh
Dagda aka Dag Dia (Daghdha)
Daire
Delbaeth (Dealbhaeth)
Dian Cecht
Donn
Ecne
Egobail
Elatha (Elaladha)
Elcmar (Ealcmhar)
Goibniu (Goibhniu)
Len
Lir
Luchtaine aka Luchta
Lug aka Lugh
Mac Cuill, Mac Cecht and Mac Greine
Manannan mac Lir
Miach
Midir (Midhir)
Mug Ruith
Nechtan
Neit- Irish god of war, Husband of Nemain and/or Badb
Nuada (Nuadha)
Ogma (Oghma)
Seonaidh
Tethra
Tuirenn (Tuireann)
Female
Aibell (Aoibheall)
Aimend
Aife
Aine
Airmed aka Airmid
Anand aka Anann aka Anu
Badb (Badhbh)
Bandba (Banbha)
Bec (Beag)
Bebinn aka Befind (Bebhinn, Bebhionn or Befhionn)
Be Chuille
Beira
Birog
Boand aka Boann (Boinn)
Brigit ( Brighid or Brid)
Caer
Caillech (Cailleach)
Canola
Cessair (Ceasair)
Cethlenn (Cethleann)
Clidna (Cliodhna or Cliona)
Crob Derg (Crobh Dearg)
Danand
Danu (Dana)
Eriu (Eire)
Ernmas
Etain (Eadoin)
Ethniu (Eithne)
Fand
Finngualla (Fionnghuala or Fionuala)
Flidais
Fodla (Fodhla)
Lin Ban (Liban or Liban)
Macha
Medb (Meadhbh or Meabh
Medb Lethderg (Meadhbh or Meabh Leathdhearg)
Moffind (Mongfhionn)
Morrigan (Morrighan)
Mor Muman (Mor Mumhan)
Nemain (Nemhain)
Niam (Niamh)
Nic Naomhin
Plor na mBan
Sheela na Gig
Scathach
Tailtiu (Taillte)
4. Celtiberian Deities from the area of what is now Spain and Portugal.
Male-
Aernus
Andovelicus
Arentio (Arengio)
Bandua
Bormanicus (Bormo, Borvo)
Brigo (Brigus)
Candamius
Cariocecus
Coronus
Cosunenaecus
Cosus (Cossue, Coso)
Dercetius
Duberdicus
Durius (Durio)
Endovelicus
Enobolico (Indibilis)
Kuaniko (Quangeio, Quangeius)
Lurunis (Luruni, Luru)
Neto
Reo (Reve)
Runesocesius (Runesus)
Sucellus
Tabalienus
Tameobrigo
Tillenus
Togae (Toga)
Tongoenabiagus
Tullonius
Turiacus
Vaseco
Vordus (Vordo, Vordius)
Visucius
Female-
Arentia (Arengia)
Ataegina
Bandoga (Bandonga)
Epane (Epona, Iccona)
Nabia
Reva (Reua)
Trebaruna
Trebopala
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