At age three, he began to improve and by September was in top form, winning the St. Leger Stakes by 6 lengths.

Indy, Cigar (twice) and Lady's Secret, and British Horse of the Year winners, Brigadier Gerard and Mill Reef.

Jack B. Joel eventually sold him to Louis Jean Decazes of the Haras d'Ouilly in France.

In 1920, his French owner sold him to the Xalapa Farm of Edward Francis Simms in Paris, Kentucky.

Prince Palatine remained in the United States for the rest of his life, dying in a 1924 stable fire.