Prince Charles, who has recently spoken up for persecuted Christians in the Middle East and encouraged interfaith relations in the UK, met with faith leaders in the eastern Croatian city of Osijek on Tuesday.
Their Royal Highnesses then travelled to the Serbian capital Belgrade, where Prince Charles met with Catholic, Orthodox, Jewish and Muslim clerics.
There, the royal called on Patriarch Irinej of the Serbian Orthodox Church to continue promoting greater friendships between the country's different religious communities.
The Princes' interfaith work in the two countries is particularly significant given the region's past, where more than 8,000 Bosnian Muslims were murdered during the 1992-1995 Bosnian War.
The deaths have since been deemed genocide.
The war involved Bosnians of Orthodox Serbian and Catholic Croatian heritage, as well as others.
On Friday Charles and Camilla arrive in the Montenegran city of Cetinje, where they will visit one of the oldest preserved images of the Virgin Mary.
