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.
Descendants of Princequillo include Secretariat, who won the Triple Crown in 1973, as well as Seattle Slew, another Triple Crown winner, along with U.S. Horse of the Year winners A.P. Indy and Cigar, which is the second highest money-winning horse ever.