Alexander (Aleksandar Karadjordjevic), Crown Prince of Yugoslavia (L) welcomes Charles, Prince of Wales, at the Royal Palace in Belgrade on March 16, 2016. After visiting Croatia, Prince Charles and his wife arrived to a two-day visit to Serbia, part of a regional tour that will include Serbia, Montenegro and Kosovo. / AFP / ANDREJ ISAKOVIC (Photo credit should read ANDREJ ISAKOVIC/AFP/Getty Images)

Alexander (Aleksandar Karadjordjevic), Crown Prince of Yugoslavia (L) welcomes Charles, Prince of Wales, at the Royal Palace in Belgrade on March 16, 2016. 
After visiting Croatia, Prince Charles and his wife arrived to a two-day visit to Serbia, part of a regional tour that will include Serbia, Montenegro and Kosovo.    / AFP / ANDREJ ISAKOVIC        (Photo credit should read ANDREJ ISAKOVIC/AFP/Getty Images)