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      Constantine's conversion to Christianity

      Lesson details

      Learning outcome

      I can explain why the Romans’ acceptance of Christianity changed during Constantine's rule.

      Key learning points

      1. By 312 CE, Constantine had become the emperor of the Western Roman Empire by defeating his rivals in many battles.
      2. Before one of these battles he had a vision of a cross; he ordered his soldiers to paint crosses on their shields.
      3. Constantine converted to Christianity, saying all religions could be practised and Christians should not be persecuted.
      4. In 324 CE, Constantine became sole emperor of the Roman Empire and in 330 CE created a new eastern capital.
      5. In 325 CE, Constantine brought together Christian bishops to try to agree the first set of rules about Christianity.

      Keywords

      • Emperor - an emperor is a ruler of an empire

      • Convert - to convert to a new religion or belief is to change to a different religion or belief

      • Rival - a rival is a person who competes with someone else to get what only one of them can have

      • Vision - a vision is a dream or idea in your imagination

      • Bishop - a bishop is a religious leader in some Christian churches

      Common misconception

      Constantine forced everyone in the Roman Empire to be Christian during his rule.

      Constantine issued a law, the Edict of Milan, that protected all faiths from religious persecution so that everyone in the Roman Empire could practise the religion they wanted.

      Teacher tip

      For learning cycle 3, read the Nicene Creed with the pupils to understand its significance. It addresses key theological issues of the time, particularly the nature of the Trinity and the divinity of Jesus Christ.

      Content guidance

      Depiction or discussion of discriminatory behaviour

      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.
      Place the historical periods in the correct order.

      1 - the Roman kingdom
      2 - the Roman Republic
      3 - the Roman Empire
      4 - the Roman Empire splits in two
      5 - the fall of the Western Roman Empire
      6 - the end of the Eastern Roman Empire

      Q2.
      What is Christianity?

      a religion based on the teachings of Muhammad (PBUH)
      Correct answer: a religion based on the teachings of Jesus Christ
      a religion based on the teachings of Buddha

      Q3.
      Match the word to its meaning.

      Correct Answer:legacy,something that left a lasting impact on history

      something that left a lasting impact on history

      Correct Answer:religion,belief in a god or gods

      belief in a god or gods

      Correct Answer:persecution,to be treated badly because of your religion, race or beliefs

      to be treated badly because of your religion, race or beliefs

      Q4.
      The Eastern Roman Empire was also known as the Empire.

      Ottoman
      British
      Correct answer: Byzantine
      Russian

      Q5.
      Why were early Christians persecuted in the Roman Empire?

      Correct answer: They refused to worship Roman gods.
      They worshipped only Roman gods.
      Correct answer: They refused to worship the emperor as a god.
      They worshipped the emperor as a god.

      Q6.
      The capital of the Byzantine Empire was...

      London
      Athens
      Rome
      Correct answer: Constantinople

      6 Questions

      Q1.
      Who was the first Christian Roman emperor?

      Diocletian
      Julius Caesar
      Augustus
      Correct answer: Constantine

      Q2.
      Match the keyword to its definition.

      Correct Answer:emperor,a ruler of an empire

      a ruler of an empire

      Correct Answer:rival,a person who competes with someone else

      a person who competes with someone else

      Correct Answer:bishop,a religious leader in some Christian churches

      a religious leader in some Christian churches

      Q3.
      Put the events about Constantine's life in the correct order.

      1 - As a child, he witnessed the persecution of Christians.
      2 - Before the Battle of Milvian Bridge, he had a vision of a cross in the sky.
      3 - Constantine converted to Christianity.
      4 - He became the emperor of the Western Roman Empire by defeating his rival.
      5 - In 324 CE, Constantine became sole emperor of the Roman Empire.
      6 - He brought together Christian bishops to agree the rules about Christianity.

      Q4.
      Constantine moved the capital from Rome to Byzantium, which he renamed...

      Rome
      Correct answer: Constantinople
      London
      Contantius

      Q5.
      What was the Edict of Milan?

      Correct answer: It made it legal for Christians to practise their religion openly.
      It made it legal for Christians to be persecuted.
      Correct answer: It allowed for freedom of religion throughout the Empire.
      Everyone in the Empire had to worship the Roman gods.

      Q6.
      Why was the Council of Nicaea important for Christianity?

      It decided which parts of the Bible were more important than others.
      Correct answer: It brought unity among Christians.
      It decided that Constantine was a god and should be worshipped.
      Correct answer: It encouraged the acceptance of Christianity among the Romans.

      To help you plan your 4 history lesson on: Constantine's conversion to Christianity, download all teaching resources for free and adapt to suit your pupils' needs...