Looking at the register Maximillian was baptised in 1759 not 1756. He may be the man who died in Dublin in 1847.
LABAT, Maximilian Joseph; 87; Dublin DUB IRL; Cork Examiner (COR IRL); 1847-4-7
or
March 30, at Upper Dorset-street, aged 88. Joseph Labat, formerly Chief of the Discount-office, Bank of Ireland.
06 April 1847 - Dublin Evening Post
or http://census.nationalarchives.ie/reels/dw/IRE_DIOC_007246544_00035.pdf