"We belong to God and to Him we shall return ... May God have mercy on you, my brother, my support and my companion", Sheikh Mohammed bin Rashid Al Maktoum said in a Twitter post on Wednesday.
Sheikh Hamdan was known as a philanthropist, as he established several educational projects and scholarships for young scientists in various fields. He was also a big fan of thoroughbred horse racing, investing in breeding farms and horse racing operations across the world.