Prince William, 39, second in family line, the Queen Elizbeth asked her grandson to represent her following the death of His Highness Sheikh Khalifa Bin Zayed Al Nahyan, President of the United Arab Emirates and Ruler of Abu Dhabi.
The Queen Elizbeth, 96, rarely travels overseas due to her mobility issues limiting her public outings. However, Prince Charles, 73, is scheduled to start his royal tour in Canada.
The Queen sent a message of condolences via official twitter account.
"I am saddened to hear of the death of His Highness Sheikh Khalifa bin Zayed Al Nahyan, President of the United Arab Emirates and Ruler of Abu Dhabi, Your distinguished brother devoted his life to serving the people of the United Arab Emirates and his relationship with its allies and friends. He will be long remembered by all who work for regional stability, understanding between nations and between faiths, and for the conservation cause. I offer Your Highness my sincere condolences and I extend my sympathy to the people of the United Arab Emirates."