Pre-Roman Britannia (before 43 AD):
* Boudica: A queen of the Iceni tribe, famous for her rebellion against Roman rule in 60-61 AD. Though ultimately unsuccessful, her story represents resistance to Roman occupation.
* Caratacus: A leader of the Catuvellauni tribe who fiercely resisted Roman expansion in the early years of Roman rule.
* King Cunobelin: A powerful king of the Catuvellauni who minted his own coins and had a strong influence over much of southern Britain.
Roman Britannia (43 AD - 410 AD):
* Emperor Claudius: Responsible for the Roman conquest of Britannia in 43 AD.
* Aulus Plautius: The Roman general who led the conquest of Britannia.
* Hadrian: Roman emperor who built Hadrian's Wall, a massive defensive structure across the north of Britain.
* Septimius Severus: Roman emperor who spent a significant time in Britain and campaigned against the Picts and Caledonians.
* Constantius Chlorus: Roman emperor who spent his later years in Britain and died there in 306 AD.
Post-Roman Britannia (after 410 AD):
* King Arthur: A legendary figure, possibly based on a historical leader, who is said to have fought off Saxon invaders.
* Saint Patrick: A 5th-century missionary who is credited with converting the Irish to Christianity.
* King Æthelberht of Kent: The first Anglo-Saxon king to convert to Christianity, which influenced the spread of Christianity in England.
* Alfred the Great: King of Wessex who repelled the Viking invasion and established a unified Anglo-Saxon kingdom.
Middle Ages:
* William the Conqueror: Duke of Normandy who invaded and conquered England in 1066, leading to the Norman Conquest.
* King John: King of England who signed the Magna Carta in 1215, which limited the king's power.
* Eleanor of Aquitaine: A powerful queen who influenced politics and culture in England and France.
* Geoffrey Chaucer: A 14th-century writer, best known for *The Canterbury Tales*, which offers a fascinating glimpse into medieval English life.
Later Periods:
* Queen Elizabeth I: A powerful and influential monarch who reigned during the Elizabethan Era, a period of great cultural and economic growth in England.
* Oliver Cromwell: A military leader who led the Parliamentarian forces to victory in the English Civil War and established a republic.
* William Shakespeare: A renowned playwright and poet, considered one of the greatest writers in the English language.
* Isaac Newton: A physicist and mathematician who made groundbreaking discoveries about gravity and motion.
* Winston Churchill: Prime Minister of the United Kingdom during World War II, known for his leadership and inspiring speeches.
This is just a small selection of important people in Britannia. There are many other individuals who have shaped the history and culture of this island nation.
To narrow your focus, please tell me which period of history you'd like to learn more about, and I can provide more specific information about important figures.