** FILE ** Qatar's Sheikh Abdul Rahman Bin Saud Al Thani, left, escorts Prince Charles, center, and his wife Camilla during their visit to the Museum of Islamic Art in Doha, Qatar, Wednesday, March 13, 2013. (AP Photo/Osama Faisal)

Photo by: OSAMA FAISAL

** FILE ** Qatar's Sheikh Abdul Rahman Bin Saud Al Thani, left, escorts Prince Charles, center, and his wife Camilla during their visit to the Museum of Islamic Art in Doha, Qatar, Wednesday, March 13, 2013. (AP Photo/Osama Faisal)