London-Sheikh Hamdan bin Rashid al Maktoum, one of the most influential figures in horse racing over the past four decades, has died at the age of 75, his brother Sheikh Mohammed announced on Twitter on Wednesday.

Sheikh Hamdan enjoyed huge success on the racecourse, winning both the Epsom Derby and the Melbourne Cup twice.

His blue-and-white colours were most recently carried to glory by champion sprinter Battaash last year. The older brother of Sheikh Mohammmed, the ruler of Dubai, he was champion flat owner in Britain eight times.

Aside from spending liberally at the horse sales each year he was also a successful breeder and generous sponsor of races. Sheikh Hamdan also owned three stud farms, in England, Ireland and in the hotbed of thoroughbred breeding in the United States, Kentucky.

His two Derby successes came with Nashwan (1989) and Erhaab (1994) while his Melbourne Cup successes were with At Talaq (1986) and Jeune (1994).

Richard Hills rode many winners for Sheikh Hamdan before assuming the role of assistant racing manager at his Shadwell operation. “It’s very sad news,” he said in comments carried in the Racing Post. “It’s like losing a boss and a father as I’ve known Sheikh Hamdan my whole life. “He was such a good man and we were very close. “I know he was very frustrated about not being able to come to Royal Ascot last year when we had six winners as he loved Ascot. He’ll be sorely missed.”

Sheikh Hamdan was patron of the Arabian Racing Organisation and the motivating force behind the establishment of the Dubai International Arabian Races, Europe’s premier Arabian racing programme which has its finals day at Newbury racecourse each year.

                  His death follows that of Prince Khalid Abdullah of Saudi Arabia in January, who was also a towering figure in the racing world.