What is "sinndar"

Sinndar, (foaled 27 February 1997) is a retired Irish Thoroughbred racehorse and active sire. In a racing career which lasted from September 1999 until October 2000 he ran eight times and won seven races. He is notable for his unique achievement in winning the Epsom Derby, Irish Derby Stakes and Prix de l'Arc de Triomphe in the same year.