Pope Leo XIV is beginning the first foreign trip of his papacy. Over the next six days he will first visit Turkey for an historic Christian anniversary. He will then visit Lebanon just days after Israeli airstrikes on its capital, Beirut.

Visits to both countries had originally been planned by the late Pope Francis, but the overarching theme – building bridges – is one Pope Leo has made his own from the moment he stepped onto the balcony of St Peters Basilica after his election in May.

In the first six months of his papacy, he has conveyed a sense of being extremely measured, even cautious. But on this trip, his powers of diplomacy will be closely scrutinised

A key moment of the trip will take place in the Turkish town of Iznik, the site of the ancient city of Nicaea. Pope Leo and leaders of other Christian traditions will gather to mark the anniversary of an ancient council that took place there 1,700 years ago. In 325 AD, among other key decisions, more than 200 bishops at the council affirmed the belief that Jesus was the son of God, eventually leading to what's known as the Nicene Creed.

Eastern and Western branches of Christianity later dramatically split, but during this trip there will be messages of togetherness and healing divisions.