2019/20: two-year-old season

King's Legacy began his racing career in a mid-week maiden at Rosehill Gardens Racecourse finishing in third placing. The colt then started at the odds of 5/1 in the B J McLachlan Plate at Eagle Farm Racecourse. Under the guidance of jockey Kerrin McEvoy the horse won by a margin of half a length.^[3]

As a result of this win, King's Legacy gained a start in the Magic Millions Classic for two-year-olds a fortnight later. He finished in 5th placing. After a break of two months, he next started in the Golden Slipper Stakes at the odds of 80/1 and was beaten some 7 lengths into 9th placing. After the race jockey Damian Lane stated, "They were a little bit sharp for him but he ran well, he's looking for a little bit further.”^[4]

Two weeks later, he contested the Group 1 Sires' Produce Stakes. After settling in last position for jockey Hugh Bowman, the horse appreciated the extra 200 metres of the Sires' to win by half a length at the odds of 18/1. Trainer Peter Snowden stated after the race, "He was always going to be a horse that was going to get better at 1400 metres, it is exciting to get the group One with him because he is a very valuable colt now.”^[5]

After his success in the Sires', King’s Legacy became the 38th individual Group 1 winner for his sire Redoute's Choice who died 12 months previously.^[6]

After winning the Sires', King's Legacy was successful in his second Group 1 in winning the Champagne Stakes.^[7]

2020/21: three-year-old season

King's Legacy resumed on the 12 September 2020 when finishing last of 7 runners in The Run To The Rose. He showed much improvement at his next start in the Golden Rose when finishing 3rd behind Ole Kirk at odds of 20/1.

The horse was spelled after running unplaced in both the Caulfield Guineas and Cantala Stakes. He was retired from racing after unplaced runs in the Hobartville Stakes and Randwick Guineas.