An Archbishop who makes history and faces challengespublished at 12:23 BST
Imogen James
Live reporter
Today marked a moment in history for the Church, as the role of Archbishop of Canterbury was given to a woman for the first time in its near 500-year history.
In her first address in the role, Mullally thanked the women that had gone before her. She also spoke of the "quieter and stronger" hope offered by the Anglican church in an "age that craves certainty and tribalism".
Prime Minister Keir Starmer said he wishes her "every success", while the King congratulated Mullally.
Dame Sarah Mullally takes the helm during a difficult period for the Church of England, after its former leader - Justin Welby - resigned over a safeguarding scandal.
Mullally told Canterbury Cathedral today that "it won't be easy" to address the "misuse of power" within the Church, but acknowledged she had already seen a "cultural shift".
She will be officially confirmed in the role in January, followed by an enthronement service.
Our live coverage is ending here, but you can read more about the Archbishop and what's next for her in this take by our religion editor.