Britain's Prince Charles and his wife Camilla Duchess of Cornwall, stands on Bridge of Santa Trinita downtown Florence, Italy, March 31, 2017. REUTERS/Tony Gentile - RTX33KBJ

Britain's Prince Charles drinks a coffee next to his wife Camilla, Duchess of Cornwall at a bar in Sant'Ambrogio market, in downtown Florence, Italy April 3, 2017. REUTERS/Tony Gentile - RTX33TJY

Britain's Prince Charles and his wife Camilla Duchess of Cornwall, stands on Bridge of Santa Trinita downtown Florence, Italy, March 31, 2017. REUTERS/Tony Gentile - RTX33KF1

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall visit the Sant'Ambrogio market in downtown Florence, Italy April 3, 2017. REUTERS/Tony Gentile - RTX33TKA

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall pose at Pitti Palace in downtown Florence, Italy April 3, 2017. REUTERS/Tony Gentile - RTX33UN0

Britain's Prince Charles shakes hands as he arrive with his wife Camilla Duchess of Cornwall ( unseen) at the Bridge of Santa Trinita downtown Florence, Italy, March 31, 2017. REUTERS/Tony Gentile - RTX33KBB

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall visit the Sant'Ambrogio market in downtown Florence, Italy April 3, 2017. REUTERS/Tony Gentile - RTX33TK8

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall, stand in front of some cheese as they visit the Teatro del Sale in downtown Florence, Italy, April 3, 2017. REUTERS/Maurizio Degl'Innocenti/Pool - RTX33V2H

Britain's Prince Charles and his wife Camilla Duchess of Cornwall, stands on Bridge of Santa Trinita downtown Florence, Italy, March 31, 2017. REUTERS/Tony Gentile - RTX33KC2

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall arrive to visit the Opificio delle Pietre Dure (Workshop of semi-precious stones) in downtown Florence, Italy April 3, 2017. REUTERS/Stefano Rellandini - RTX33TYQ

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall, stand in front of some cheese as they visit the Teatro del Sale in downtown Florence, Italy, April 3, 2017. REUTERS/Maurizio Degl'Innocenti/Pool - RTX33V2J

Britain's Prince Charles and his wife Camilla Duchess of Cornwall, arrives at the Bridge of Santa Trinita downtown Florence, Italy, March 31, 2017. REUTERS/Tony Gentile - RTX33KAN

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall visit the Sant'Ambrogio market in downtown Florence, Italy April 3, 2017. REUTERS/Tony Gentile - RTX33TJZ

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall, smile in front of some cheese as they visit the Teatro del Sale in downtown Florence, Italy, April 3, 2017. REUTERS/Maurizio Degl'Innocenti/Pool - RTX33V2M

Britain's Prince Charles and his wife Camilla Duchess of Cornwall, poses on Bridge of Santa Trinita downtown Florence, Italy, March 31, 2017. REUTERS/Tony Gentile - RTX33K96

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall stand at a bar in Sant'Ambrogio market, in downtown Florence, Italy April 3, 2017. REUTERS/Tony Gentile - RTX33TJF

Britain's Prince Charles and his wife Camilla, Duchess of Cornwall pose at Pitti Palace in downtown Florence, Italy April 3, 2017. REUTERS/Tony Gentile TPX IMAGES OF THE DAY - RTX33UMZ