The best of his offspring were Diolite , who won the 2000 Guineas in 1930 and the Irish Oaks winner Theresina .
Diophon was retired from racing at the end of his four - year - old season to become a breeding stallion .
The best of Diophon 's offspring were Diolite , who won the 2000 Guineas in 1930 and the Irish Oaks winner Theresina .
Diophon was retired from racing at the end of his four - year - old season to become a breeding stallion .