Aidan O'Brien and his jockey son Joseph enjoyed a treble with Parliament Square (4-9), Warwick Avenue (5-2) and Chicago (5-2) at Fairyhouse on Sunday.
Warwick Avenue kept Blue Corner at bay by a head after making all the running in the Value Packages At Fairyhouse Race.
The winning rider said: "He is improving with every run and he is a horse with a great attitude."
Parliament Square, fifth in the Windsor Castle Stakes at Royal Ascot, landed the odds to open his account at the fourth attempt in the Irish Stallion Farms EBF Maiden.
O'Brien junior said: "He's improving with racing and hopefully he'll keep going. He'll have no problem stepping up to Listed or Group company."
Chicago led just inside the final furlong to run out a cosy winner of the Fairyhouse Sunday Market Handicap.
They went close to a four-timer when Unanimous had to play second fiddle to the Pat Smullen-ridden Encrypted Message (11-4) in the Family Funday At Fairyhouse Maiden.
Winning trainer Dermot Weld said: "He had the form to win that and I thought he would win it.
"He is consistent, that's his level and Pat gave him a good strong ride. On testing ground you want a horse that gets further than seven furlongs and he does."
Wayne Lordan, successful in the day's feature, completed a double on Colour Of Love (13-2) for trainer Willie McCreery in the Fairyhouse Members Handicap, the four-year-old filly just holding Invincible Ridge by a nose.
McCreery said: "She is a tough little devil. She needs the splits and six furlongs is her ideal trip.
"She ran a blinder at the Curragh last time out. We might have a look at a Listed fillies' race in Naas for her now but we will see what the handicapper does.
"She needs blinkers as she likes looking at the crowd."