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HH Sheikh Khalifa bin Zayed was appointed ruler of Abu Dhabi on November 3rd, 2004.
Sheikh Zayed Mosque or Sheikh Zaid Mosque is in Abu Dhabi.
Sheikh Khalifa bin Zayed bin Sultan Al Nahyan
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.
HH Sheikh Khalifa bin Zayed was appointed ruler of the UAE on November 3rd, 2004. He is still currently ruler of the UAE.