A significant milestone in British history is reached on Sunday as the Queen becomes the country's first monarch to reign for 70 years. Throughout that time, Her Majesty has remained a fervent supporter of the Turf. In the first of a three-part series, John Berry looks back at the Queen's strong ties to horseracing. Racing, the king of sports, has been the sport of kings and queens since the dawn of time. In Great Britain, the monarch's love of the sport can be traced back at least 500 years to...