Snowmist produced Best Percentage after a meeting with Gold And Ivory, and Best Percentage threw a Group 1 winner of her own in the form of Danni Martine, who won a Coolmore Classic and was placed in a Doncaster Mile.
King Of Roseau's dam is Choisir mare Dominica, who is the last of Danni Martine's seven foals.
The Aurie's Star Handicap is unlikely to be the final straight-track feature King Of Roseau contests this season with trainer Peter Snowden already planning a return with 1200m Group 2 races including the Bobbie Lewis Quality and Gilgai Stakes potential targets.
His only straight-track experience prior to the Aurie's Star Handicap came in the Listed Poseidon Stakes last spring, when he finished third being classy colts Growing Empire and First Settler.
"Now we know he really likes Flemington there's no doubt we'll be back at some time through the year," Snowden said after the win.
"Not every horse handles Flemington down the straight, but this horse has got a bit of an affinity for it and that was a dominant win there today."
King Of Roseau has now won his past three starts, lifting his career record to four wins and six placings from 18 starts.