Sky Atlantic's new drama series Britannia has been taking viewers by storm.
The show is set in 43AD, when the Romans (under senator Aulus Plautius), invaded Britain.
Described as a 'swords and sandals' series by TV critics, the action begins as the Romans are coming.
Acclaimed writer Jezz Butterworth is behind
Here is everything you need to know about the history behind the show.
Who ruled Briton before the Roman invasion?
At the time of the Roman invasion Britain was not governed by one ruler, instead there were multiple tribes each led by a chief, king or queen.
Before the invasion various British tribes were allies of the Romans and some even traded with them, but history has not recorded much of this.
Some tribes names - such as the Cantiaci (of Kent), the Trinovantes (of Essex) and the Durotriges (of Dorset) - were kept by the Roman government when they built brand new towns.
Why did the Romans invade?
In the early 1st century The Roman Empire stretched from Syria to Spain and the land of Britain appealed to the superstate, mainly due to its resources - iron, tin, lead, gold and grain.
At the time the Romans believed it to be a state full of barbarians. Julius Caesar had led two expeditions to southern Britain, but these came to nothing.
It wasn't until 41 AD - when there was political upheaval in Britain - that the Romans decided to try once again, under the rule of Claudius.
Not much is known about the invasion, except that forces landed on the Kent coast and fought their way inland - but there is no real evidence to support this theory.
The invasion was done in phases, the first one being led by Plautius - played by The Walking Dead's David Morrissey in the series.
Some tribes, such as the Trinovantes (based in what is now known as Colchester) resisted the advances of the Roman forces, however some - like the Atrebates (of Berkshire) - supported them and were subsequently rewarded for it.
The south of England was captured, and then the Romans turned their attention to what is now known as Wales. Not all of Britannia was ruled by The Roman Empire.
Are Queen Antedia and Kerra real?
Ancient Britain was egalitarian, and led by both male and female rulers. Historians know very little about the tribes, but there is evidence of some of the leaders on Celtic coins and in the pages of Roman writers and historians.
Kerra (True Detective's Kelly Reilly), daughter of the King of the Cantii, is forced to put her differences aside with arch-rival Queen Antedia (Harry Potter's Zoë Wanamaker) to face their invaders.
Unfortunately, there is no evidence that Antedia and Kerra ever existed.
Did the druids exist?
A druid was a member of the high-ranking professional class in Celtic history, they held posts such as religious leaders, legal authorities and medical professionals.
Druids were not just indigenous to Briton, their presence was recorded in France in the mid-50s BC by Julius Caesar.
However, there is only one definitive reference to them in the British Isles, and it was recorded by the Roman writer Tacitus, who said they were committing acts of human sacrifice in AD 60.The Office star Mackenzie Crook plays Veran, a sinister druid sorcerer fighting against the invaders. in Britannia.