Frank Shamrock
The Lion's Den has also engaged in a feud with Gracie Jiu Jitsu. The Lion's Den claims that their submission fighting style is superior to Gracie Jiu Jitsu, while the Gracie's have maintained that their style is superior. Specifically, Ken Shamrock has been a longtime rival of Royce Gracie, and Frank Shamrock has engaged in a feud with the Cesar Gracie camp.