The Archbishop of Canterbury has condemned the 'terrible violence inflicted on innocent people' worldwide, standing in solidarity with Pope Leo XIV following his clash with President Donald Trump.
Dame Sarah Mullally also highlighted the importance of speaking up for and defending 'the dignity and worth of every human being', including refugees.
She was preaching in the Italian capital ahead of her meeting with Pope Leo at the Vatican on Monday.
Her words come at a time when the Pope has faced scathing criticism from President Trump, who earlier this month branded the religious leader 'weak on crime, and terrible for foreign policy' and demanded he 'focus on being a great Pope, not a politician'.
The pontiff had used his first Easter message to strongly criticise war, calling on 'those who have weapons (to) lay them down'.
Leo doubled down on his comments following Mr Trump's criticism, warning during his recent four-nation Africa tour that the world is being 'ravaged by a handful of tyrants'.
He said he regrets that his 'tyrant' remarks were interpreted as a response to criticism from Trump, insisting he has no interest in debating the US leader.
The Pontiff, 70, claimed they had been written well before Trump's 'comment on myself and on the message of peace that I am promoting'.
The Archbishop of Canterbury condemned the 'terrible violence inflicted on innocent people' worldwide
Dame Sarah Mullally also highlighted the importance of speaking up for and defending 'the dignity and worth of every human being', including refugees
'And yet it was perceived as if I were trying to start a new debate with the president, which doesn't interest me at all,' Leo said.
'Much of what has been written since then has been more commentary on commentary trying to interpret what has been said,' he said.
Trump had said on April 12 he was 'not a big fan of Pope Leo', and accused him of 'toying with a country (Iran) that wants a nuclear weapon'.
He later doubled down on his comments to reporters with a post on Truth Social, saying: 'I don't want a Pope who thinks it's OK for Iran to have a Nuclear Weapon.'
'Pope Leo is weak WEAK on Crime, and terrible for Foreign Policy,' the US leader said.
He added: 'I don't think he's doing a very good job. He likes crime I guess.
'We don't like a Pope who says it's ok to have a nuclear weapon. We don't want a Pope that says crime is ok. I am not a fan of Pope Leo.'
She was preaching in the Italian capital ahead of her meeting with Pope Leo at the Vatican on Monday
Pope Leo XIV speaks to journalists aboard a flight on his way to Luanda, Angola. The Pope faced scathing criticism from US President Donald Trump , who earlier this month branded the religious leader 'weak on crime'
Dame Sarah issued a statement at the time backing the Pope's calls for peace.
She said she stood in solidarity with the pontiff 'in his courageous call for a kingdom of peace' and urged 'all those entrusted with political authority to pursue every possible peaceful and just means of resolving conflict'.
On Sunday, she delivered a sermon at St Paul's Within the Walls - the first non-Roman Catholic church to be built within the city's walls - calling for justice and peace.
She said: 'The Book of Wisdom reminds us that 'God did not make death… but created all things so that they might exist'.
'God's desire is life - life in its fullness, life shared, life given.
'And yet, we look at our world today and often we see something very different: instead of making justice and peace a priority, we see terrible violence inflicted on innocent people in conflicts across the globe.
'In such a world, the Church cannot lose confidence in the Gospel. For the Gospel is precisely this: that life, not death, has the final word; that Christ has broken the power of violence, not by greater force, but by self-giving love.'
Dame Sarah is on her first pilgrimage to Rome since being formally enthroned in March as the first woman to hold the role of top bishop in the Church of England.
The purpose of her four-day visit is said by Lambeth Palace to be to 'strengthen Anglican-Roman Catholic relations' and 'aims to deepen bonds of communion, affirm a shared witness, and encourage ongoing collaboration at both global and local levels'.
In her sermon on Sunday at the Episcopal church, she also described an 'increasingly polarised world', in which she said the Church must continue 'its outward service and acts of love: in care for the marginalised, in welcome to the stranger, in accompaniment of refugees and those who find themselves displaced, unseen, or unheard'.
Dame Sarah is expected to meet the Pope on Monday morning for private prayer and discussion, after which each will give an address.
The archbishop will also join the Pope for midday prayer in the Chapel of Urban VIII within the Apostolic Palace.