John Timson & Mary Reily

[waterlily]

I found the following marriage record and am searching for some information about it:
Date of Marriage:11 Dec 1815;  Parish/District: St Michael's;
County: Limerick; Husband:John Timson; Wife:Mary Reily both COI
Denomination:Church of Ireland
His Occupation:84th Regt
Here's what I'm looking for:
Anything about John Timson or Mary Reily
Witnesses to their marriage
Information about the 84th Regt. I know nothing about it.
Is this church the St. Michael's in Limerick City because that church wasn't completed until 1844 and this marriage was in 1815, so I need clarification on that. Thanks for your help!

[waterlily]

Thanks so much for your input.