Mornington Glory is the last foal and the second Group 1 winner out of Crowned Glory (Danehill), who won the Gr.3 Thoroughbred Breeders' Stakes and was second in the Gr.1 Golden Slipper Stakes in Australia. Her other produce includes Hallowed Crown (Street Sense), a multiple Group 1 winner in Australia whose wins include the Gr.1 Golden Rose Stakes and now a sire, and Needs Further (Encosta De Lago), winner of the Gr.3 Carbine Club Stakes and a sire.

The second dam Significant Moment (Bletchingly) is a half-sister to the Group 1 winners and sires Zabeel (Sir Tristram) and Baryshnikov (Kenmare).

Third dam Lady Giselle (Nureyev).

The fourth dam Valderna (Val De Loir) is a half-sister to Detroit (Riverman), winner of the Gr.1 Prix de l'Arc de Triomphe and dam of another Arc winner in Carnegie, and to Durtal (Lyphard), winner of the Gr.1 Cheveley Park Stakes and dam of Gildoran, a dual winner of the Gr.1 Gold Cup.

Crowned Glory was retired from breeding in 2020.