Big Brown
I will assume by "derby" you mean Kentucky Derby. I will also assume that you only mean winners of the Derby. There have been two Derby-winning horses with 15 letters in their names: Foolish Pleasure (1975) and Fusaichi Pegasus (2000).
No. It has always been held in Kentucky, not Tennessee. Hence the name "Kentucky Derby".
The answer is Willie Shoemaker and his horse Ferdinand who won the 1986 Kentucky Derby
Pleasant Colony won the 1981 Kentucky Derby with Jockey Jose Velasquez.
The "sister race" for the Kentucky Derby is the Kentucky Oaks. The Oaks is a mile-and-an-eighth race is for 3-year-old fillies. It is held the Friday before the Derby.
The Run for the Roses
The Louisville Jockey Club Course was where the first Kentucky Derby was held. That was the original name of the Churchill Downs racetrack, where the Derby still is being held. Whatever the name, the world-famous grounds are located in Louisville, Kentucky.
Mine That Bird.
Churchill Downs is the name of the track that's used for the Kentucky Derby. It's located in Louisville, Kentucky. It has been the site of the world-famous race since 1875.
Churchill Downs is the name of the racetrack at which the Kentucky Derby is held. Louisville is the name of the big city in Kentucky where the racetrack is located. The original name of the racetrack was the Louisville Jockey Club Course.
Ferdinand.