I will assume by "derby" you mean Kentucky Derby. In 1984 the winning horse in the Kentucky Derby was Swale, who was a son of Seattle Slew, the 1977 Triple Crown winner. Swale lost the Preakness, finishing 7th, but came back to win the Belmont Stakes 3 weeks later.
The 1981 Derby winner was Pleasant Colony ridden by Jorge Velasquez.
The Irish invented horseracing. It began as a game of how fast can your new horse run but then grew. When the Irish immigrated over to the United States, the sport became nation wide. The sport was especially popular in Kentucky, and thus the Kentucky Derby was the name of the game. Heres a good site http://www.ibiblio.org/fiddlers/Playingponies2.htm
Kentucky Derby was created in 1875.
Thoroughbreds compete in the Kentucky Derby.
Irish Derby was created in 1866.
It was Clark who started the Kentucky Derby.
The first Kentucky Derby race was run in 1875.
Kentucky Derby Museum was created in 1984.
The Kentucky Derby is always the first Saturday of May.
Orb won the 2013 Kentucky Derby.
Thoroughbred horses compete in the Kentucky Derby.