Morny Cannon my great uncle won the tripple crown first on Flying Fox in 1899, and nearly won a second Tripple Crown in 1900 on the Kings Horse Diamond Jubilee but the horse but Diamond Jubilee had a different idea and proved too troublesome for Cannon as told in his own words

“Another Horse that I found difficult to ride was the Kings Horse Diamond Jubilee. I was to ride him in the Derby and all the classic races, and I went down to Newmarket in March to get accustomed to h...im. I rode him in a gallop, and went quietly and well before I got off to change, and put the stable boy back on him. I was no sooner away from him then he savaged me in the left arm, threw me down and knelt on me, he fell over on his side and as he righted himself, Jones his boy jumped on his back. It was one of the smartest things I had ever seen. Later on I tried to approach Diamond Jubilee again, but though in his box he was perfectly quiet, as soon as I walked in he became very excited and, pouring with perspiration, came at me like a dog on a chain. I cleared. I had one more attempt at riding him, but on that occasion he tore his breast cloth to pieces, and showed generally that he preferred my room to my company. It was some consolation to me that I was not the only man he took a dislike to; he bit Jack Watts in the leg when he was only two years old."