Charles Dunbar Dublin baptism

[Rosezi]

I am searching for a Dublin baptism for my 4x great-grandfather Charles Dunbar born abt 1824. He married a Margaret Weldon in St. Paul's AAron's Quay, Dublin in 1845, they had 3 children, Mary, Catherine and Margaret also baptised in the same parish between 1845-1848. The family moved to England, and in 1851 where living in Birkenhead, Cheshire.  Charles was a journeyman stone mason.  Not sure if there is a family connection, but his daughter Margaret married an Alexander Dunbar from Belfast, in Liverpool 1869. I am not certain which part of Ireland Charles is from, so I thought Dublin was the best place to start. They were Roman Catholic.  Any information would be a great help