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      The division of the Roman Empire

      Lesson details

      Learning outcome

      I can explain what happened to the Roman Empire when it was split in two.

      Key learning points

      1. The Emperor Diocletian thought that the Roman Empire had too many problems and that it should be split in two.
      2. Emperor Constantine fought to reunite the empire; he created a new capital called Constantinople in 330 CE.
      3. The reunited Roman Empire was only temporary and it separated permanently in 395 CE.
      4. The Western Roman Empire fell in 476 CE; the Eastern Roman Empire became the Byzantine Empire.
      5. The Byzantine Empire was still thought of as Roman but over time the culture and traditions changed.

      Keywords

      • Legacy - a legacy is something from the past that affected history and left a lasting impact on the world

      • Constantinople - Constantinople was the capital of the Byzantine Empire

      • Temporary - temporary means something that will disappear over time

      • Byzantine Empire - the Byzantine Empire is the name given by historians to the eastern half of the Roman Empire

      • Permanent - when something lasts a long time or forever, it is permanent

      Common misconception

      People in Byzantine times never called themselves Byzantium.

      People in Byzantine times always called themselves Roman.

      Teacher tip

      Children could use the Greek alphabet in the second learning cycle to write their names.

      Content guidance

      Depiction or discussion of violence or suffering

      Supervision

      Adult supervision recommended

      Licence

      This content is © Oak National Academy Limited (2026), licensed on Open Government Licence version 3.0
      except where otherwise stated. See Oak's terms & conditions
      (Collection 2).

      Lesson video

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      Prior knowledge starter quiz

      6 Questions

      Q1.
      Cleopatra was the queen of ...

      Correct Answer: Egypt, egypt, Ptolemaic Egypt, ptolemaic egypt

      Q2.
      Match the name of the person to their title.

      Correct Answer:Romulus,king

      king

      Correct Answer:Julius Caesar,dictator

      dictator

      Correct Answer:Augustus,emperor

      emperor

      Q3.
      Why was Julius Caesar referred to as a dictator?

      he was a weak leader
      Correct answer: he had complete power and control over Rome
      he liked to talk a lot
      he had to share power with the Senate

      Q4.
      A war between different groups of people from the same country is known as a war.

      Correct answer: civil
      uncivil
      world
      cold

      Q5.
      Match the keyword to its definition.

      Correct Answer:republic,leaders are elected by the people living in the country

      leaders are elected by the people living in the country

      Correct Answer:empire,a large area ruled by an emperor

      a large area ruled by an emperor

      Correct Answer:kingdom,a country ruled by a king or queen

      a country ruled by a king or queen

      Q6.
      How did a Roman leader show that they were strong and powerful?

      by building hospitals and libraries in the Roman Empire
      by making sure everyone in the Roman Empire had enough food
      Correct answer: by invading other territories to make the Roman Empire larger

      6 Questions

      Q1.
      Why did Diocletian believe that the Roman Empire was in crisis?

      Correct answer: It had become too big to be ruled by just one emperor
      There were not enough people living in the Empire
      Correct answer: Some provinces started to act independently of the Empire
      It was too small and looked weak compared to other empires

      Q2.
      What did Diocletian do in 286 CE?

      he conquered more territories
      Correct answer: he split the Roman Empire in two
      he stopped being the emperor
      he asked for help from another empire

      Q3.
      Constantinople, the new capital of the Eastern Roman Empire, was named in honour of Emperor ...

      Augustus
      Diocletian
      Julius Caesar
      Correct answer: Constantine

      Q4.
      Match the empire to its capital.

      Correct Answer:Byzantine Empire,Constantinople

      Constantinople

      Correct Answer:Western Roman Empire,Rome

      Rome

      Correct Answer:Eastern Roman Empire,Constantinople

      Constantinople

      Q5.
      Some historians believe that the Byzantine Empire’s main legacy is that it helped spread which religion?

      Correct answer: Christianity
      Islam
      Judaism
      Hinduism

      Q6.
      The main language of the Byzantine people changed from Latin to ...

      Correct answer: Greek
      Byzantine
      Roman

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