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  (Photo: Press Association via AP Images / Chris Ison)
  In this file photo, the Archbishop of Canterbury, Dr. Rowan Williams, waits for Pope Benedict XVI to arrive at Lambeth Palace on the second day of his State Visit, September 17, 2010.

Archbishop of Canterbury Dr. Rowan Williams will join in the anniversary celebration of a unity council at the Vatican next week. The visit follows the resignations of five Anglican bishops who converted to the Roman Catholic Church.

Williams, the spiritual leader of Anglicans worldwide, will visit the Vatican on Nov. 17 in honor of the 50th anniversary of the Pontifical Council for the Promotion of Christian Unity, according to a news release from the Vatican press office Wednesday. The council aims, in part, to develop dialogue and collaboration with the other churches and world communions.

Metropolitan John Zizioulas of Ecumenical Patriarchate of Constantinople and the Archbishop Kurt Koch, president of the council, will also attend.

Earlier this week, it was confirmed that five bishops would defect from the Anglican Communion to the Catholic Church. On Monday, Williams accepted "with regret" the resignations of the Church of England bishops who left over the ordination of women, among other things.

The bishops issued a statement explaining their reasons for leaving the Anglican body: "[P]articularly we have been distressed by developments in Faith and Order in Anglicanism which we believe to be incompatible with the historic vocation of Anglicanism and the tradition of the Church for nearly two thousand years."

They said they would resign from their pastoral responsibilities on Dec. 31 and join an ordinariate once one is created by the Roman Catholic Church.

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The Vatican has welcomed the defected bishops which include three serving bishops and two retired.

Last year, the Vatican made a historic decision announcing it would create an apostolic constitution that would provide Vatican guidelines on integrating disaffected Anglicans into the Roman Catholic Church. Pope Benedict XVI made the provision in response to the numerous requests he received from Anglicans who were unhappy with the ordination of women and noncelibate gay bishops.

More details on the ordinariate will be announced following a meeting among Catholic cardinals on Nov. 19. The Catholic Bishops’ Conference of England and Wales said in statement that they "will be exploring the establishment of the ordinariate and the warm welcome we will be extending to those who seek to be part of it."

The structure would allow converts to enter into full communion with Rome but still retain certain Anglican rituals and traditions. For example, married clerics would be able to become Catholic priests but not Catholic bishops.

One of the breakaway bishops, John Broadhurst, the Bishop of Fulham, predicts that an exodus of "thousands" of lay Anglicans will occur once the ordinariate is formed.

"There are lots of people interested. Some are actively looking at it," Bishop Broadhurst told The Australian.