When Bridgeport’s Black Rock Castle closed several years ago, owner Patrick Clyne headed to New Canaan and The Gates restaurant.

His friend and current business partner, Kevin O’Halloran, spent eight years at The Field, also in the Black Rock neighborhood, and most recently at the Little Pub in Cos Cob.

Now, the two Irish natives can be found at The Castle on Post, an Irish pub in one of two small commercial malls on the Post Road, which over the last few years have evolved into a haven for restaurants at the eastern gateway to town.

“A friend of mine said this was available,” O’Halloran said. “Me and Patrick were talking about doing something together for the last few years. This was the ideal space.”

Next door to the Lobster Post, the pub has a warm and cozy interior that takes first-time visitors by surprise.

“It was subtle changes to the place,” O’Halloran said, and “warm and cozy” was exactly what the owners were aiming for. “So far, the feedback has been positive,” he said. The new Castle is drawing back a lot of former Black Rock Castle customers, O’Halloran said.

Open since late September, the pub was preparing for an official ribbon cutting scheduled earlier this week. “It’s exhausting,” O’Halloran admits, but exciting as well.

The menu includes appetizers like wings and mussel stew, salads, sandwiches, burgers and entrees that include chicken marsala, pesto shrimp, bangers and mash and shepherd’s pie.

The Castle on Post, 222 Post Road, is open Sunday through Thursday from 11:30 a.m. to midnight, and Friday and Saturday from 11:30 a.m. to 1 a.m. For details, visit thecastleonpost.com .