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Sheikh Tamim Bin Hamad Bin Khalifa Al Thani
There wasn't one. HH Sheikh Zayed bin Sultan was the founder and ruler of the UAE until November 2, 2004 when he passed away.
Sheikh Mohammed was never ruler of the UAE, he is the current ruler of the Emirate of Dubai within the UAE
Hamad ibn Isa Al Chalifa
Sheikh Sabah1
King Hamad bin Isa Al-Khalia
HH Sheikh Khalifa bin Zayed was appointed ruler of the UAE on November 3rd, 2004. He is still currently ruler of the UAE.
HH Sheikh Khalifa bin Zayed was appointed ruler of Abu Dhabi on November 3rd, 2004.
Sheikh Saad Al-Abdullah
The Sheikh was a generic title given to a royal male at birth or the ruler of a tribe, so it doesn't indicate one specific person.
Sheikh Saqr Bin Mohammad Al- Qassimi
January 2006.