Princequillo's descendants include, Secretariat, Triple Crown Winner in 1973, Triple Crown winner Seattle Slew and U.S. Horse of the Year winners A.P. Indy and Cigar, the second greatest money winner of all time.
Princequillo's descendants include notable racehorses like Secretariat, Seattle Slew, A.P. Indy, and Cigar, who have all achieved significant success in their racing careers.