Aidan O'Brien had the 2/1 favourite Ark in the 1m4f fillies' maiden but it was well-bred stablemate Perotan (9/1) who came home best of all to make a winning debut on the rain-softened ground.
The daughter of Churchill, a three-parts sister to Bangkok and related to a host of other winners, was settled behind the leaders before being pushed along two furlongs out. Once switched to the outer over a furlong from home, she really found her stride and stayed on well under hands and heels to score by a length and three quarters from Isota. Ark was a further neck away in third.
The winner holds entries in the Irish Oaks and Nassau Stakes later in the month.
Winning rider Seamie Heffernan said: "She has a little bit of class, always worked like a nice filly. She won well at the line, so hopefully she keeps progressing.