Pope Leo XIV prayed at the Armenian Apostolic Cathedral in Istanbul on Sunday in a gesture of support for Christian unity and Christian minorities in Turkey.

Beyond its ecumenical symbolism, the visit signals quiet support of ongoing efforts to heal century-old wounds between Turkey and Armenia, long scarred by mass killings and decades of mistrust, observers note.

An estimated 1.5 million Armenians died in massacres, deportations and forced marches that began in 1915 in Ottoman Turkey.

Historians widely view the event as genocide.

Turkey denies the deaths constituted genocide, saying the toll has been inflated and those killed were victims of civil war and unrest.

It has lobbied to prevent countries from officially recognizing the massacres as genocide.