Out of Irish Oaks winner Great Heavens, who is a sister to Nathaniel, the seven-year-old was sent off the 7/4 favourite in the colours of Envirogreen Housing Services Ltd.
A good fifth of 17 when last seen at the Punchestown Festival in 2022, the bay victor was settled behind the leaders, improving to the front before three out.
While he wasn't fluent at the last, he kept on well for pressure on the run-in, coming home four-and-a-half lengths to the good.
"Darragh was brilliant on him and knows him better than anyone. He is a lovely horse and off 124, I thought was entitled to have a go for a maiden," de Bromhead commented.
"He hadn't run for a long time and I wasn't sure he would be fit enough, but everyone has done a great job at home.
"He had a lot of good runs and ran really well in Punchestown (2022) before we got him. He got hurt and Tom (O'Connor, owner) has been patient but I'm delighted he has been rewarded. Tom would love to have a runner at Galway and he could go for a novice there."
O'Keeffe and de Bromhead had earlier taken the opener with Bojak