The 61-year-old who was appointed to the top job within the Church of England in 2013, has changed his mind on the country exiting the bloc and had previously warned of the possible consequences of Brexit and now believes the future is “optimistic” for the country outside of the EU.
Previously the Most Rev Welby has said he would be voting to remain within the EU as he thought the UK should be “a country for the world”.
The Archbishop wrote in June 2016: "But for my part, based on what I have said and on what I have experienced I shall vote to remain.
Archbishop of Canterbury Justin Welby has embraced Brexit
"I hope and pray that the result will be reached with the aim of a good Britain in a good Europe, whether as part of the EU or not. I pray that each person's vote will be based on generosity, hope, confidence.
"I pray that we will then reunite with immense determination to be a gift to the world of today and to future generations.”
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He had also clashed with the then Ukip leader Nigel Farage over what he thought were his attempts to stir up racism.
However he has now changed his mind. In an interview with the BBC Radio 4 current affairs programme the World At One, alongside the Bank of England Governor Mark Carney, he said: “I’m not in the slightest bit pessimistic – quite the reverse, I think there are now huge opportunities.
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Justin Welby, the head of the Church of England, has now come out in favour of Brexit