The archbishop of Canterbury agreed to take a DNA test after rumours developed his father was not, as he always thought, Gavin Welby. 

The tests revealed Justin Welby was actually born of a brief liaison between his mother, Jane Williams, and the late Sir Anthony Montague Browne. 

In response to the revelations, Justin Welby has issued the following statement: 

In the last month I have discovered that my biological father is not Gavin Welby but, in fact, the late Sir Anthony Montague Browne.

This comes as a complete surprise.

My mother (Jane Williams) and father (Gavin Welby) were both alcoholics. My mother has been in recovery since 1968, and has not touched alcohol for over 48 years. I am enormously proud of her.

My father (Gavin Welby) died as a result of the alcohol and smoking in 1977 when I was 21.

As a result of my parents' addictions my early life was messy, although I had the blessing and gift of a wonderful education, and was cared for deeply by my grandmother, my mother once she was in recovery, and my father (Gavin Welby) as far as he was able.

I have had a life of great blessing and wonderful support, especially from Caroline and our children, as well as a great many wonderful friends and family.

My own experience is typical of many people. To find that one's father is other than imagined is not unusual. To be the child of families with great difficulties in relationships, with substance abuse or other matters, is far too normal.

By the grace of God, found in Christian faith, through the NHS, through Alcoholics Anonymous and through her own very remarkable determination and effort, my mother has lived free of alcohol, has a very happy marriage, and has contributed greatly to society as a probation officer, member of the National Parole Board, Prison Visitor and with involvement in penal reform.

She has also played a wonderful part in my life and in the lives of my children and now grandchildren, as has my stepfather whose support and encouragement has been generous, unstinting and unfailing.

This revelation has, of course, been a surprise, but in my life and in our marriage Caroline and I have had far worse. I know that I find who I am in Jesus Christ, not in genetics, and my identity in him never changes. Even more importantly my role as Archbishop makes me constantly aware of the real and genuine pain and suffering of many around the world, which should be the main focus of our prayers.

Although there are elements of sadness, and even tragedy in my father's (Gavin Welby's) case, this is a story of redemption and hope from a place of tumultuous difficulty and near despair in several lives. It is a testimony to the grace and power of Christ to liberate and redeem us, grace and power which is offered to every human being.

At the very outset of my inauguration service three years ago, Evangeline Kanagasooriam, a young member of the Canterbury Cathedral congregation, said: "We greet you in the name of Christ. Who are you, and why do you request entry?" To which I responded: "I am Justin, a servant of Jesus Christ, and I come as one seeking the grace of God to travel with you in His service together." What has changed? Nothing!