Thomas Burke, father of William Martin Burke

Hi I'm coming to Loughrea next weekend 3rd June for a weeks holiday, and bringing my parents with me. We are going to try to get further with our family tree. We can but hope. Here's what I have so far. William Martin Burke born circa 1817/1818 in Loughrea. Ended up in London England getting married, and on his wedding certificate it said that his father is called Thomas Burke, and that Thomas Burke's profession was "Gentleman". I believe that this means that he was a man of distinction / well to do? Anyway the only birth record that I could find with a William Martin Burke born to father named Thomas Burke in Loughrea was on roots Ireland, and the church baptism record said born on 10 October 1816, baptised 12 oct 1816 which was earlier than I expected, but possible I guess, and that he was a Roman Catholic. On here it said that the mothers name was Mary Lynch. Nowhere can I find a marriage between a Thomas Burke and a Mary lynch. I am beginning to wonder if this family was anything to do with Burke's of Marble hill? Seeing as he was classed a gentleman, and I also know that Marble hill had its own chapel, and so I'm wondering if maybe they got married there? Long shot and probably grabbing at straws! Does anyone know the family history for Marble hill? Or details from the chapel there? Ideas of where to look when we come over next week? Any help greatly appreciated.