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Henry Cecil, 70, trained champion British race horses

Sir Henry with Frankel at the Royal Ascot. The horse won all 14 of his races.

A. Crowhurst/Getty Images/2012

Sir Henry with Frankel at the Royal Ascot. The horse won all 14 of his races.

LONDON — Sir Henry Cecil, who trained unbeaten superstar Frankel and was one of British horse racing’s greatest trainers in a career spanning nearly half a century, died Tuesday following a long battle with cancer. He was 70.

Sir Henry’s death was announced on the website of Warren Place Stables, where the Scotsman worked for 44 years.

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Knighted by Queen Elizabeth II in 2011, Sir Henry was champion trainer in Britain 10 times. He capped his career by training one of racing’s all-time great horses, Frankel, who was retired last year after winning all 14 of his races.

‘‘His unique talents as one of Britain’s greatest racehorse trainers, epitomized by his successes with Frankel, have played a major part in growing the sport’s profile around the world, for which we will be forever in his debt,’’ said Rod Street, chief executive of the British Champions Series.

Sir Henry was diagnosed with stomach cancer in 2006.

After capturing his first classic winner at the 2,000 Guineas with Bolkonski in 1975, he trained four Derby winners.

In 1985, Sir Henry’s Oh So Sharp became the first filly since 1955 to win English racing’s three classics: the 1,000 Guineas, Oaks, and St. Leger.

US jockey Steve Cauthen rode Oh So Sharp to England’s Triple Crown in 1985 at the start of their successful six-year partnership with Sir Henry.

‘‘He was a super intelligent guy and really knew how to place his horses,’’ Cauthen said. ‘‘He tried to have fun.”

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