Geoffrey Chaucer made it two wins from as many starts with a workmanlike victory in the Juddmonte Beresford Stakes at the Curragh.
Aidan O'Brien's Montjeu colt was following in the hoofprints of Alamshar (2002), Azamour (2003), Sea The Stars (2008) and O'Brien's St Nicholas Abbey (2009) in landing the Group Two over a mile.
Ballydoyle’s first sting was sent off a heavily backed 4-7 favourite following his debut win at Leopardstown.
Partnered by the trainer's son Joseph, Geoffrey Chaucer was settled in behind rivals until being unleashed to challenge the front-running All Set To Go.
Despite obvious signs of inexperience, the Montjeu colt gradually got on top and was good value for his winning margin of a length and a quarter.
It was a one-two for the Ballydoyle team, with Oklahoma City coming through to grab the runner-up spot.
Geoffrey Chaucer is now set for a step up to Group One level in the Racing Post Trophy at Doncaster on 26 October.
O'Brien snr said: "He didn't learn much the first day and we were hoping there'd be more pace today, which there was.
"He learned nothing in front the first day, but I'd say he learned plenty today and he was still a bit green when he hit the front.
"If everything goes to plan, he'll go to Doncaster for the Racing Post Trophy."
Another horse with potential Classic aspirations is the John Oxx-trained My Titania, who claimed Group Three honours in the CL Weld Park Stakes.
The first foal of Oxx's incredible colt Sea The Stars to wear the same colours of owner Christopher Tsui, the 11-10 favourite had to be kept up to her work by Declan McDonogh to fend off the challenge of Chicago Girl by half a length.
Oxx said: "She's a very nice filly and we've high hopes for her. She's by Sea The Stars and she's his first Group winner. It's very nice he's had his first Group winner in those colours and that we have such a nice filly for the future.
"She won't run any more this year. She's had three runs now and she's pretty sharp in her mind and very alert.
"If all goes well through the winter and the spring, we'll probably enter her in the English Guineas and in the Oaks at Epsom."
The O'Brien-trained odds-on favourite Guerre had to make do with the runner-up spot in the Listed Anglesey Lodge Equine Hospital Blenheim Stakes as Paul Deegan's Shining Emerald (7-2) turned in a brilliant display.
Deegan said: "I'm absolutely delighted with him. He quickened well and put it to bed well. He's smart.
"Hopefully he will go now for the Killavullan Stakes (Leopardstown, 26 October)."
Dermot Weld's Tested (5-1) made a most impressive start to her career with a debut victory in the Irish Stallion Farms EBF Fillies Maiden.
Weld said: "She's definitely a Stakes filly. It was a bit rough early on and she got buffeted about a bit, but Pat took his time and got her balanced.
"I doubt I'll run her again this year, because unquestionably she's a Group class filly for next year.
"I think she'll learn an awful lot from it (the run), but she has natural talent and that will carry her a long way."
Tommy Stack and Wayne Lordan combined to take the Mongey Communications Joe McGrath Handicap with 10-1 shot Nero Emperor, while trainer-jockey Johnny Murtagh took the Irish Times Handicap with 4-1 favourite Campanology.
The O'Brien's were also on the mark with Eye Of The Storm who eventually wore down the game mare Missunited in the Irish Field Loughbrown Stakes.
Missunited had finished in front of Eye Of The Storm at Galway but met the 8-13 favourite on much worse terms on this occasion.
Seamie Heffernan tried to steal it from the front on Missunited and it was not until deep inside the final furlong that the Ballydoyle representative, who only has one eye, got on top by three-quarters of a length.
O'Brien snr said: "We were feeling our way with the trip a bit but Joseph said he got it well in the end.
"The runner-up is a credit to Mick Winters.
"I'm not sure if he'll run again, if we don't he's one to look forward to next year."