Boudica(aka Boudicca, Budica, Budicca, boadicea) was queen of the Iceni, the Iron-age British tribe around Norfolk. Her husband Prasutagus ruled as an ally of Rome. According to Tacitus:
Prasutagus, king of the Iceni, ... had made the emperor his heir along with his two daughters, under the impression that this token of submission would put his kingdom and his house out of the reach of wrong. But the reverse was the result, so much so that his kingdom was plundered by centurions, his house by slaves, as if they were the spoils of war. First, his wife Boudicea was scourged, and his daughters outraged. All the chief men of the Iceni, as if Rome had received the whole country as a gift, were stript of their ancestral possessions, and the king's relatives were made slaves.
So in 60 or 61AD Boudica led the Iceni, Trinovantes and others in revolt destroying Camulodunum (Colchester) eventually they were confronted by Suetonius in battle. The location of this battle is unknown. Suetonius' last known location was London and there were still Roman army units in North Wales. So a myth has grown up that the battle took place as Suetonius travelled up Watling Street to meet up with army units in North Wales. However this would have been suicidal because it would allow the Iceni to easily cut off his supply lines from the continent and from Roman allies in the SE, it would leave these allies and major Roman assets vulnerable to attack and it would prevent any retreat from Britain by Suetonius which would necessarily have taken place in SE England.
However despite the suicidal nature of moving northward away from his supply lines and with no evidence to support the assertion the battle is frequently stated as being the battle of Watling Street.
Cassio Dio's Account
She now grasped a spear to aid her in terrifying all beholders and spoke as follows:
 "You have learned by actual experience how different freedom is from slavery. Hence, although some among you may previously, through ignorance of which was better, have been deceived by the alluring promises of the Romans, yet now that you have tried both, you have learned how great a mistake you made in preferring an imported despotism to your ancestral mode of life, and you have come to realize how much better is poverty with no master than wealth with slavery. For what treatment is there of the most shameful or grievous sort that we have not suffered ever since these men made their appearance in Britain? Have we not been robbed entirely of most of our possessions, and those the greatest, while for those that remain we pay taxes? Besides pasturing and tilling for them all our other possessions, do we not pay a yearly tribute for our very bodies? How much better it would be to have been sold to masters once for all than, possessing empty titles of freedom, to have to ransom ourselves every year! How much better to have been slain and to have perished than to go about with a tax on our heads! Yet why do I mention death? For even dying is not free of cost with them; nay, you know what fees we deposit even for our dead. Among the rest of mankind death frees even those who are in slavery to others; only in the case of the Romans do the very dead remain alive for their profit. Why is it that, though none of us has any money (how, indeed, could we, or where would we get it?), we are stripped and despoiled like a murderer's victims? And why should the Romans be expected to display moderation as time goes on, when they have behaved toward us in this fashion at the very outset, when all men show consideration even for the beasts they have newly captured?
 "But, to speak the plain truth, it is we who have made ourselves responsible for all these evils, in that we allowed them to set foot on the island in the first place instead of expelling them at once as we did their famous Julius Caesar, — yes, and in that we did not deal with them while they were still far away as we dealt with Augustus and with Gaius Caligula and make even the attempt to sail hither a formidable thing. As a consequence, although we inhabit so large an island, or rather a continent, one might say, that is encircled by the sea, and although we possess a veritable world of our own and are so separated by the ocean from all the rest of mankind that we have been believed to dwell on a different earth and under a different sky, and that some of the outside world, aye, even their wisest men, have not hitherto known for a certainty even by what name we are called, we have, notwithstanding all this, been despised and trampled underfoot by men who nothing else than how to secure gain. However, even at this late day, though we have not done so before, let us, my countrymen and friends and kinsmen, — for I consider you all kinsmen, seeing that you inhabit a single island and are called by one common name, — let us, I say, do our duty while we still remember what freedom is, that we may leave to our children not only its appellation but also its reality. For, if we utterly forget the happy state in which we were born and bred, what, pray, will they do, reared in bondage?
 "All this I say, not with the purpose of inspiring you with a hatred of present conditions, — that hatred you already have, — nor with fear for the future, — that fear you already have, — but of commending you because you now of our own accord choose the requisite course of action, and of thanking you for so readily co-operating with me and with each other. Have no fear whatever of the Romans; for they are superior to us neither in numbers nor in bravery. And here is the proof: they have protected themselves with helmets and breastplates and greaves and yet further provided themselves with palisades and walls and trenches to make sure of suffering no harm by an incursion of their enemies. For they are influenced by their fears when they adopt this kind of fighting in preference to the plan we follow of rough and ready action. Indeed, we enjoy such a surplus of bravery, that we regard our tents as safer than their walls and our shields as affording greater protection than their whole suits of mail. As a consequence, we when victorious capture them, and when overpowered elude them; and if we ever choose to retreat anywhere, we conceal ourselves in swamps and mountains so inaccessible that we can be neither discovered or taken. Our opponents, however, can neither pursue anybody, by reason of their heavy armour, nor yet flee; and if they ever do slip away from us, they take refuge in certain appointed spots, where they shut themselves up as in a trap. But these are not the only respects in which they are vastly inferior to us: there is also the fact that they cannot bear up under hunger, thirst, cold, or heat, as we can. They require shade and covering, they require kneaded bread and wine and oil, and if any of these things fails them, they perish; for us, on the other hand, any grass or root serves as bread, the juice of any plant as oil, any water as wine, any tree as a house. Furthermore, this region is familiar to us and is our ally, but to them it is unknown and hostile. As for the rivers, we swim them naked, whereas they do not across them easily even with boats. Let us, therefore, go against them trusting boldly to good fortune. Let us show them that they are hares and foxes trying to rule over dogs and wolves."
 When she had finished speaking, she employed a species of divination, letting a hare escape from the fold of her dress; and since it ran on what they considered the auspicious side, the whole multitude shouted with pleasure, and Buduica, raising her hand toward heaven, said:
"I thank thee, Andraste, and call upon thee as woman speaking to woman; for I rule over no burden-bearing Egyptians as did Nitocris, nor over trafficking Assyrians as did Semiramis (for we have by now gained thus much learning from the Romans!), much less over the Romans themselves as did Messalina once and afterwards Agrippina and now Nero (who, though in name a man, is in fact a woman, as is proved by his singing, lyre-playing and beautification of his person); nay, those over whom I rule are Britons, men that know not how to till the soil or ply a trade, but are thoroughly versed in the art of war and hold all things in common, even children and wives, so that the latter possess the same valour as the men. As the queen, then, of such men and of such women, I supplicate and pray thee for victory, preservation of life, and liberty against men insolent, unjust, insatiable, impious, — if, indeed, we ought to term those people men who bathe in warm water, eat artificial dainties, drink unmixed wine, anoint themselves with myrrh, sleep on soft couches with boys for bedfellows, — boys past their prime at that, — and are slaves to a lyre-player and a poor one too. Wherefore may this Mistress Domitia-Nero reign no longer over me or over you men; let the wench sing and lord it over Romans, for they surely deserve to be the slaves of such a woman after having submitted to her so long. But for us, Mistress, be thou alone ever our leader."
Boudicea, with her daughters before her in a chariot, went up to tribe after tribe, protesting that it was indeed usual for Britons to fight under the leadership of women.
"But now, it is not as a woman descended from noble ancestry, but as one of the people that I am avenging lost freedom, my scourged body, the outraged chastity of my daughters. Roman lust has gone so far that not our very persons, nor even age or virginity, are left unpolluted. But heaven is on the side of a righteous vengeance; a legion which dared to fight has perished; the rest are hiding themselves in their camp, or are thinking anxiously of flight. They will not sustain even the din and the shout of so many thousands, much less our charge and our blows. If you weigh well the strength of the armies, and the causes of the war, you will see that in this battle you must conquer or die. This is a woman's resolve; as for men, they may live and be slaves."
Notes: Boudicca's name appears in various forms including (Boudicea, Boadicea & Boudica). The only contemporary rendering is from Tacitus who gives it as Boudicca. Later Cassius Dio gives it as Βουδουικα, Βουνδουικα, and Βοδουικα: which suggests a form Boudou-ika . Then in 1534 Polydore Vergil invented the name "Boadicia" (Anglica Historia, II.5-6) and the variant "Boadicea" occurred as a misprint in 1624.