Hi
The valuation book for Enniskillen in 1836 has
William Lucy Main st house office and yard £20 0 0
The dwelling is 18 ft long 27 1/2 feet wide and 18 1/2 ft high
Addition 20 x 13 1/2 7 1/2 high
stable 49 x 13 1/2 15 ft high.
Info taken 1835 and tax Dec 1836.
He was entitled to vote from 21 Oct 1833 so with the Great Reform Act that extended the vote to the top riches fifth of men in the UK.
The 1846 Slater directory gives a William Lucy porter and spirit dealer at Tonystick Enniskiillen
Also a Mervyn Lucy same address and occupation.
1862 Griffiths Valuation
William Lucey Castle st lease of William Dane £10
four down from Earl of Enniskillen pub.
There is a death of a William Lucy in June qtr 1886 at Enniskillen age 77 which would fit.
Castle st 19 Feb 1886 William Lucy 77 Grocer and publican married paralysis 3 months Inf widow Eliza Lucy Reg 17th June 1886.
I can't see a marriage or death for Eliza after that.
This may be his Will
https://apps.proni.gov.uk/WillsCalendar_IE/willsSearchResultsDetails.aspxWilliam Lucy late of Doogery Cty Fermanagh Gentleman 1888 but the date of death doesn't match.
Mervyn died in Enniskillen in 1870 age 66 so perhaps William's brother.
The protestant church records are at PRONi but don't seem to be on line.
The Mormans seem to have microfilmed them but you'll need to go to one of their libraries.(only 1666-1826 for them.)
Ciderdrinker