Visigoths, Ostragoths, vandals, Gauls. One might mention also the Britons and the Saxons, but the first three as far as I know were the major ones.

I think there are two separate questions here. There are tribes (mostly Celtic) who were the original inhabitants of areas that Rome expanded into. Then there are lots of tribes (Germanic this time) who profited from the fall of the Roman Empire. So you have three waves of expansion: Celtic, Roman, and Germanic. The poor Gauls (ancestors of the French) fell well before the Romans did. They were a Celtic tribe. The Britons were Celts too. They lived in England (both on their own and under Roman domination) until the Germanic invaders pushed them back into Wales and across the Channel into Brittany (both Britain and Brittany are named after them). And the original inhabitants of Iberia (Spain/Portugal) are also believed to have been Celtic, but the Romans wiped them out even more brutally than they did the Gauls. There are also a variety of other Germanic tribes that moved around quite a bit taking advantage of the fall of Rome. The Angles, Saxons, and Jutes (from Northern Germany/Denmark area) went to England in the fifth century. The Franks went to France around the same time (that's where France gets its name from, and Charlemagne was a Frank). The Visigoths ruled Spain for a few centuries until the Arab invasion of 711. The Lombards, I believe, were in Northern Italy. The Burgundians must have been in or near Burgundy, which is basically the eastern part of modern-day France. And the Vandals and the Ostrogoths were also major Germanic tribes, although I can't say I remember where they lived. Probably in what is now Germany, though, since we seem to have covered the other regions...

There were many, including the original tribes of the Italian peninsula. The first thing that must be taken into account is that the Romans were simply a single tribe that exerted its influence over others. On the peninsula were other Italic-speaking peoples such as the Sabini (Sabines)(who were Latins but had adopted Greek as their lingua franca, due to their dealings with the Greek speaking colonies on the peninsula),the Oscii (with subtribes the Samnite, Marrucine, Paelignan, Vestinian, Sabine, and Marsian peoples). , the Umbri and the Latii, from which the word Latin comes. The Lombards were also in the north. They were Germanic. Also on the peninsula were the Etruscans, who were probably not even Indo-European. All these tribes were assimilated by the time of the Empire, when the Romans expanded into other areas, but their languages are still represented in the dialects of Italy. The tribal groups of Gaul (modern France) are known from Roman documents. There were many of them, and their ultimate defeat was due to the fact that it was difficult for them to federate because of rivalries. These are their names, with their capitals beside them: Aedui Bibracte Allobroges Vienne Ambiani Amiens Andecavi Angers Aquitani Bordeaux Atrebates Arras Arverni Gergovia Baiocasses Bayeux Boi Bologna Bellovaci Beauvais Bituriges Bourges Carnutes Chartres Catalauni Châlons-en-Champagne Cenomani Brescia Coriosilitae Corseul Helvetii La Tene Insubres Milan Lemovices Limoges Lexovii Lisieux Mediomatrici Metz Medulli Medoc Medulli Vienne Menapii Cassel Morini Boulogne sur Mer Namnetes Nantes Nervii Bavay Orobii Bergamo Osismii Vorgium Parisii Paris Petrocorii Perigueux Pictones Poitiers Raurici Kaiseraugst (Augusta-Raurica) Redones Rennes Remi Reims Santones Saintes Senones Sens Sequani Besançon Suessiones Soissons Tigurini Yverdon Tolosates Toulouse Treveri Trier Tungri Tongeren Turones Tours Unelli Coutances Vangiones Worms Veliocassi Rouen Vellavi Ruessium Veneti Vannes Viducasses Vieux Vocontii Vaison-la-Romaine ==== The tribes of Britain were also many. Wikipedia lists them as: Central Britain Catuvellauni - modern Hertfordshire, Cambridgeshire and Greater London north of the Thames Cornovii - modern Cheshire, Derbyshire and Shropshire Corieltauvi - modern Lincolnshire, Nottinghamshire and Staffordshire Dobunni - modern Gloucestershire, Herefordshire, Oxfordshire and West Midlands Iceni - modern Norfolk, Suffolk and Cambridgeshire Parisi - modern East Yorkshire Trinovantes - modern Essex and Suffolk [edit] Northern Britain Brigantes - modern Yorkshire, Cumbria, Lancashire and County Durham Caereni - modern west Sutherland Caledonii - Scottish Highlands Carnonacae - modern west Ross and Cromarty Carvetii - modern northern Cumbria, around Carlisle and the upper valley of the River Eden* Cornavii - modern east Sutherland and Caithness Corionotatae - modern Scottish borders, probably a sept of the Selgovae Creones - modern Argyll Damnonii - modern Strathclyde Decantae - modern east Ross and Cromarty Epidii - modern Mull of Kintyre Gabrantovices - modern North Yorkshire* Lopocares (name uncertain) - south side of Hadrian's Wall around Corbridge* Lugi - modern south east Sutherland Novantae - modern Dumfries and Galloway Selgovae - modern Scottish Borders and eastern Dumfries and Galloway Setantii - part of modern Lancashire around the Fylde* Smertae - Ross and Cromarty Taexali - modern Aberdeenshire Textoverdi - south side of Hadrian's Wall in the upper valley of the River Tyne* Vacomagi - modern north Grampian region Venicones - modern Fife and southern Tayside Votadini - coasts of modern Northumberland, Scottish Borders and East Lothian Asterisked (*) tribes were septs or pagi within Brigantine territory. [edit] Southern Britain Atrebates - modern Hampshire and the Thames Valley Belgae - (in this context) modern Hampshire and Gloucestershire Cantiaci - modern Kent Durotriges - modern Somerset and Dorset Dumnonii - modern Devon, Cornwall and Somerset Regnenses - modern Surrey and Sussex [edit] Western Britain Deceangli - modern Flintshire and Denbighshire Demetae modern Pembrokeshire and west Ceredigion and Carmarthenshire Gangani - modern Lleyn peninsula, likely a sept of the Ordovices Ordovices - modern Anglesey, Snowdonia and Powys Silures - modern South Wales ========== Waiting on the outskirts of the Empire and poised to strike at any time were the Frankish tribes, Germanic speaking peoples, who would eventually overrun the Roman empire in the 5th century. Wikipedia lists these: The Franks or the Frankish peoples were an ever-changing confederation of west Germanic tribes, such as the Salians, Sicambri, Chamavi, Tencteri, Chattuarii, Bructeri, Usipetes, Ampsivarii. The Salians, later preeminent among the tribes, were a "proto-Dutch" (Old Low Franconian) speaking people. The Franks first appeared in history around 260. Sometimes the Franks allied with non-Old Frankish speaking tribes as the Frisians and Chatti and occasionally with Saxons. They were not originally grouped into one tribe, but "as with the other barbarians, they belonged to much smaller groups that would join constantly changing confederations."[1] +++++++++++ ON the eastern borders of the Empire, and even within it at some points were Slavic tribes, such as the Serbii and the Hrvati (modern Croats). +++++++++ The Greeks had long been under Roman rule, but differences in language and culture still existed between the Macedonians and the "true" Greeks. ============= In North Africa, there were tribal groups such as the Berber, the Nubians and the Copts (the Arabs had not yet entered Egypt), and in the middle east there were the Jews, the Arabs. In the area known as Asia Minor and the islands of the Mediterranean, there were still many regional languages represented, as is attested by ACts 2 which speaks of the miracle of Pentecost: 5Now there were staying in Jerusalem God-fearing Jews from every nation under heaven. 6When they heard this sound, a crowd came together in bewilderment, because each one heard them speaking in his own language. 7Utterly amazed, they asked: "Are not all these men who are speaking Galileans? 8Then how is it that each of us hears them in his own native language? 9Parthians, Medes and Elamites; residents of Mesopotamia, Judea and Cappadocia, Pontus and Asia, 10Phrygia and Pamphylia, Egypt and the parts of Libya near Cyrene; visitors from Rome 11 (both Jews and converts to Judaism); Cretans and Arabs-we hear them declaring the wonders of God in our own tongues!" The tribal nature of this part of the Empire is clear from contemporary documents like this, despite the propaganda from Rome that this was a united Empire (in reality until the 2nd century, Latin was not widely used throughout the Empire: Koine Greek was used) Hope this gives you some ideas of what peoples were represented throughout the Roman Empire, showing that it was still strongly tribal, despite the best efforts of Rome to unite it.