Williams, 61, renowned for his formidable learning, announced Friday he will take up a new post as master of Magdalene College, Cambridge.
Rowan Williams: from least loved to cleverest man in the Church of England
It is not every archbishop of Canterbury who would invite a comedian, even a fellow believer like the standup Frank Skinner, to Canterbury Cathedral to discuss faith, football and the evil forces of new atheism in front of a live audience.
But the very clever, very devout, Welsh grammar-school boy Dr Rowan Douglas Williams – described on Friday by one of his many supporters as a "turbo-charged Carey" in reference to his predecessor – has never been afraid of generating headlines or ruffling feathers.
Not everyone would agree with the views of his own children, one of whom was once overheard describing his father as the cleverest man in Europe. But there are few who would challenge the claim that the bishop, poet and theologian who speaks five languages is the cleverest man in the Church of England.
But his intelligence – or, rather, his sublime confidence in his intelligence – has led directly to some of the crises that have marked his tumultuous decade as leader of a global Anglican communion sharply divided on issues of sexuality and gender.
In his youth, Williams was known for his radical views. He was closely associated with the non-violent protests against cruise missiles. In the 1980s, he considered leaving the church over its treatment of gay clergy, and even wrote the definitive case for recognising faithful, committed gay relationships in the church: The Body's Grace.
Instead of leaving, however, Williams neatly distanced himself from the Church of England by becoming archbishop of the independent Church of Wales, where he knowingly ordained gay men.
If he wanted to stay in the Anglican fold, the move across the border was his only choice; under George Carey's hand, the Church of England had become distinctly hostile to Williams's highly intellectual, libertarian views. "Williams was unquestionably one of the least loved bishops in England and Wales," a friend said.
But while his views were controversial, his intelligence and spirituality were undeniable. The synod could not deny that he stood head and shoulders above every other contender to follow in Carey's footsteps.
The first archbishop of Canterbury to brighten Lambeth Palace by introducing teenagers to its corridors, Williams had the misfortune to be rising up the ranks at a time when the church was pulling itself apart over female and gay clergy.
On the former, he was triumphant. Thanks to his efforts there will be women bishops soon. But his attempts to devise a formula to placate both advocates of female bishops, and those in the church who refuse to have anything to do with such appointments, have had limited success.
On the issue of gay clergy he has acted in ways that many find hard to forgive.
The openly homosexual Jeffrey John, the dean of St Alban's, had been a friend of Williams for many years when the latter acceded to the seat in Canterbury. The two men had released a joint pro-gay statement after the 1998 Lambeth conference.
Among Williams's first acts on entering Lambeth was to remove the name of his old friend from Carey's blacklist of clergy who would never become bishops. He put John's name forward for the relatively modest role of bishop of Reading, knowing this was a red rag to the conservative evangelicals, who had opposed his ordination from the start. But he failed to anticipate the intensity of the furore.
The crisis eventually hit such a peak that Williams, whose grand vision for a universal church takes priority over any conflict with what he sees as his duty of truth, backed down.
John was forced to withdraw his candidacy and Williams was badly damaged: if John had been forced to resign for views Williams shared, the evangelicals pointed out, why was one unfit for the bishopric of Reading while the other continued in Canterbury?
Much of Williams's time as archbishop was devoted to trying to hold the diverse churches within the Anglican communion together despite the bitter dispute over homosexuality that put conservative and growing African churches at odds with liberal churches in the United States and Canada.
Williams also caused a political storm in 2008 by suggesting that Islamic sharia law could have a role in Britain in settling some disputes. The ensuing frenzy in some quarters ignored the fact that Islamic principles were already used to settle some disputes.
The archbishop gained the support of Lord Phillips, then the senior judge in England, who said there was "no reason why sharia principles, or any other religious code, should not be the basis for mediation or other forms of alternative dispute resolution".
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A video is found at the Guardian at: http://www.guardian.co.uk/uk/video/2012/mar/16/rowan-williams-archbishop-canterbury-video?INTCMP=ILCNETTXT3487
Rowan Williams to step down as archbishop of Canterbury - video
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Rowan Williams resigns as archbishop of Canterbury
Rowan Williams is to step down as archbishop of Canterbury at the end of 2012 to take up a university position at Cambridge
- Archbishop of Canterbury honoured as 'God's apostle for our time'
- Rowan Williams: from least loved to cleverest man in the Church of England
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Rowan Williams announces resignation day after government gives the go-ahead for gay marriage ... so will Britain now have its first black Archbishop of Canterbury?
- Archbishop of York Dr John Sentamu is tipped to replace him when he leaves at the end of the year
- 'It has been an enormous privilege being Archbishop of Canterbury, you are given access to the life of churches worldwide in a really unique way,' he said
- Despite waning congregations he believes that the church is not losing popularity just that too many 'don't know how religion works'
- PM David Cameron expresses gratitude to Dr Williams for his 'support and advice' while in Downing Street
- My successor will need the 'constitution of an ox and the skin of a rhinoceros,' he said
- He will become Master of Magdalene College at the University of Cambridge from January 2013
Rowan Williams has announced he is stepping down as Archbishop of Canterbury after a turbulent decade in office.
Dr Williams said his successor would need the 'constitution of an ox and the skin of a rhinoceros.'
Leaving at the end of the year would give his successor time to prepare.
'But I certainly regard it as a real priority to try and keep people in relationship with each other.'
WHO IS IN THE RUNNING TO BE THE NEXT ARCHBISHOP?
He is often in the news whether he is sky-diving for charity, standing up for Britain's armed forces or campaigning on international issues.
Famously in 2007 he cut up his dog collar on live television in a dramatic protest against Robert Mugabe's rule in Zimbabwe and vowed never to wear one again until he stands down.
Other possible contenders to replace Dr Williams include Richard Chartres, the Bishop of London (5/2).
Dr Chartres, 64, who is close to members of the Royal Family, gave the address at the marriage of the Duke and Duchess of Cambridge last year and is known for campaigning on environmental issues.
Liverpool-born the Rt Rev Nick Baines, 54, Bishop of Bradford, is also viewed as a contender for the post (8/1)
Favourite Dr Sentamu, is dubbed by some as 'cleric of the people', he is known for his high-profile interventions.
In 2007 he cut up his dog collar on live television in a dramatic protest against Robert Mugabe's rule, vowing never to wear the symbol of his office again until the Zimbabwe president had been removed from power.
Dr Sentamu also once pitched a tent and camped in York Minster for a week, foregoing food, in solidarity with those who had suffered in the Middle East conflict.
The Archbishop has gained a reputation for supporting the armed forces - sky-diving to raise money for families of servicemen wounded or killed in Afghanistan - and for speaking out against bankers and traders responsible for the financial crisis.
'Our partnership in the gospel over the past six years has been the most creative period of my ministry. It has been life-giving to have led missions together, gone on retreats and prayed together.
DR JOHN SENTAMU: THE BELIEFS OF THE SKY-DIVING UGANDAN REFUGEE AND 'CLERIC OF THE PEOPLE'
The hot favourite to be the next Archbishop of Canterbury and first black leader of the Anglican Church has become well known for his strong opinions on the state of British society.
Dr Sentamu, pictured right, the sixth of 13 brothers and sisters, and a former barrister and judge, came to the UK in 1974 having fled Uganda where he was a critic of the dictator Idi Amin.
Dubbed by some as 'cleric of the people' he has most recently had a public row with the Government over gay marriage, accusing David Cameron of acting like a ‘dictator’ and overruling the Bible if he chose to legalise it.
He attracted controversy - and racist emails - when he spoke out against this issue.
Recently he also launched a tirade against Britain's financial institutions and bankers for their role in the collapse of the UK economy.
Using the words of Thomas Jefferson, the third President of the United States, he said: 'Banks are more dangerous than a standing army. They can destroy individuals, communities and nations.'
Famously in 2007 he cut up his dog collar on live television in a dramatic protest against Robert Mugabe’s rule, vowing never to wear the symbol of his office again until the Zimbabwe president had been removed from power.
He has also pitched a tent and camped in York Minster for a week, and sky-dived to raise money for families of servicemen wounded or killed in Afghanistan.
In an attack on England he also argued the country must do more to mark St George’s Day on April 23, warning a failure to do so would lead to greater political extremism.
Dr Sentamu’s enthronement in 2005 featured a ceremony with African singing and dancing and contemporary music, with the cleric playing African drums during the service.
Such is his popularity in his archdiocese of York that he was named Yorkshire Man of the Year in 2007.
As Bishop of Stepney in east London, Dr Sentamu acted as an adviser to the inquiry into the racist murder of Stephen Lawrence. He has also campaigned against guns, knives, drugs and gangs.
Dr Sentamu is married with two grown-up children and two grown-up foster children.

