The United Kingdom today is famous for once having the largest empire the world has ever seen. Britain’s territories spanned the world, and depending on how you look at it, the empire remained alive in some form or another until 1997, when the UK handed Hong Kong back to China.  

However, Great Britain wasn’t always a powerhouse with global influence. In fact, the British Isles were invaded a number of times by nations and tribes from all across Europe during the first millennia AD. Here’s a quick timeline of invasions on Britain. 

Celts in Britain, c. 1000 BC 

It is widely believed that Celtic tribes started arriving on the shores of Great Britain around 3,000 years ago. However, the Celts didn’t invade as such. Different Celtic tribes arrived over a long period of time, many of which shared a common culture, religious beliefs and language. 

Why the Celts decided to migrate to Britain remains debated, but many historians agree that they probably came here searching for metals such as iron, tin and copper. Many remnants of Celtic culture can still be seen today in the UK. For example, the Welsh, Scottish and Cornish languages are of Celtic origin. 

Roman Occupation, 43 AD 

Julius Ceasar and his Roman legions attempted to conquer the British Isles twice, first in 55 BC and then again 54 BC. Unfortunately for Caesar, both of his attempts failed due to stormy weather. It wasn’t until 43 AD that much of Britain was successfully captured by the Romans under Emperor Claudius. The Romans would remain in Britain until 420 AD. 

Today, some of the most impressive Roman ruins can be found at Hadrian’s Wall, which was built by the Romans to mark the empire’s northern frontier, and the Roman Baths in the city of Bath, one of the UK’s must-visit cities

Ango-Saxon Conquest, c. 450 AD 

After the Romans withdrew their troops from Britain, a number of Germanic tribes decided to settle on the island, though there was never a unified invasion. The Jutes, Angles and Saxons dominated England while the Scots and Picts fought it out in the north. In Ireland and Wales, the Celts remained dominant. 

The Anglo-Saxons had a huge impact on British culture, and many ruins built during their reign remain standing today. One of the most complete, unaltered buildings is St Laurence’s Church in Northamptonshire. You’ll also find plenty of Anglo-Saxon ruins in the city of York. 

Viking Raids, Late 8th Century AD 

Fearsome warriors from Scandinavia, mostly Denmark, starting raiding British coastal towns and monasteries around the year 787 AD. However, the most famous raid occurred in 793 AD, when the Vikings sacked Lindisfarne Monastery. Over the next century or so, Viking raids became more frequent, and the Vikings started to settle on the British Isles. By 872 AD, the Vikings had reached port cities in the south that included London. In 886 AD, Alfred the Great signed a treaty with the Viking King Guthrum. This divided England along the Thames and saw the introduction of Danelaw. 

Norman Conquest, 1066 AD 

Led by Duke William of Normandy, the Normans invaded and conquered England in 1066 AD after being victorious in the infamous Battle of Hastings. The Normans secured their stronghold over the nation by constructing forts and castles such as the Tower of London and Windsor Castle. This essentially marked the end of invasions of Britain, though a period of wars, epidemics and atrocities marked the centuries to come.