Frankel: People who knew them best discuss what made five past Champions great Brigadier Gerard: A direct contemporary of Mill Reef, he raced 18 times, won 17 including 2000 Guineas, St James's Palace, Sussex, QEII twice, Champion Stakes twice, Eclipse, Prince of Wales's and King George. Found to be ill after only defeat. Joe Mercer (Jockey): In a word he had ability. He had everything; he had presence, he was physically perfect to look at, had a good temperament, was gutsy, determined, very sound, you couldn't fault him in any way. Unbeknown to us at the time the only occasion he got beat he was under the weather. Like Frankel he was just something out of the ordinary. The Brigadier hated soft and heavy ground but he got through it as I'm sure Frankel will today. Dancing Brave: He won eight of 10 starts including the 2,000 Guineas, Eclipse, King George and Arc in 1986 when, showing incredible acceleration, he passed 10 of Europe's finest horses in the last furlong. Equally famous for the one he didn't win which was the Epsom Derby when Greville Starkey was heavily criticised for his ride. Still tops the BHA official ranking with a rating of 141 against Frankel's 140. Guy Harwood (Trainer): "Most of all he had a great engine. He also had a great temperament and was a sound horse. He had this huge ability and we always felt he didn't spend much time on the ground when he was galloping. It was something we always noticed. He was very quickly through his stride and on to the next one. His stride was also very long and he was relaxed which allowed him to get a mile and a half. His sire Lyphard wouldn't have got a mile and a half in a horsebox. Sea The Stars: A half-brother to Frankel's sire Galileo, he won eight of his nine starts. His only defeat came in his first ever race. He was not over tested at two but won all six starts at three in 2009 including 2,000 Guineas, Derby, Eclipse, International, Irish Champion and Arc. Mick Kinane (Jockey) "He was the overall package. He had no faults mentally or physically and he stayed sound. Great horses have to have that extra pace which means they can go fast comfortably for a long time. That separates them from the horses around them. A trait of his which was very different from Frankel is that he never did more than he had to. His biggest winning margin was two and a half lengths so he never had a hard race and there was always loads left. That contributed to the fact that he was as fresh for the Arc as he was for the Guineas. Of the other great I can only remember Mill Reef being as exuberant as Frankel.