 At stud, he sired 64 stakes winners and became one of the most important large-heart-producer stallions.He sired the filly Misty Morn, the 1955 U.S. Champion 3-Yr-Old Filly and U.S. Champion Handicap Female, and the 1958 American Champion Two-Year-Old Filly, Quill.Princequillo's sons include Hill Prince and Round Table, both of whom won U.S.