Britain's royals and faith leaders will gather for a moment of history when the first woman to take the role of top bishop in the Church of England will be enthroned.
A service before around 2,000 people will mark the symbolic start to Sarah Mullally's ministry as Archbishop of Canterbury.
The Prince and Princess of Wales are expected to join those gathered in Canterbury Cathedral to see the 106th Archbishop of Canterbury - and first female to hold the high office in its 1,400-year history - officially installed.
The ceremony will celebrate women, Archbishop Mullally has said, as she outlined how her historic appointment shows "it’s entirely possible for you to follow your dreams and what you want to do".
Arriving at the cathedral, she said was feeling "absolutely great" ahead of her installation.
While King Charles is technically head of the church, the archbishop has become the most senior bishop and the spiritual leader of the church and the worldwide Anglican Communion.
Charles will be represented at the ceremony by Prince William, alongside his wife Catherine.
Archbishop Mullally replaced Justin Welby in the role, after he announced his resignation in November 2024 over failures in handling an abuse scandal.
She has also previously acknowledged the challenges ahead because of the "legacy of deep harm and mistrust" she said existed after past safeguarding failures in the church.
In nods to the diversity of the Anglican Communion, various languages will feature in the service, including singing in Urdu, a Gospel reading in Spanish and a prayer in the Bemba language of Zambia.
Prime Minister Keir Starmer and Conservative Party leader Kemi Badenoch are expected to be present, with other faith leaders, charities, healthcare workers and schoolchildren.
Archbishop Mullally, who was chief nursing officer in England before she was ordained, invited NHS nurses and carers working in hospitals and hospices in Canterbury to attend the ceremony.
Other guests will include more than two dozen primates from the Anglican Communion - Christian churches around the world of which she is now the spiritual leader.
Among these will be some of the first female Anglican bishops from across Africa, who will join a procession through the cathedral.
