This 1850 Dublin "Trade Directory" by Trish Loughman lists the Business of William & Moses Taylor at 119 Francis Street.http://www.loughman.dna.ie/dublin1850/xdubdir83.html#Taylor
William resided at 1 Haddington Terrace Kingstown (Dun Laoghaire). William died before Moses. Moses died in the same year as his American namesake (the Founder of Citibank) and left holdings to the sum of more than 86,000 pounds at his death in 1882. [Even now a useful amount ... back then a small fortune] ...
Moses's executor was one Robert Johnston Goff (first Auctioneer of the Turf Club of Ireland, founder of Goff's Bloodstocks, husband to Moses's niece)
I know much of this thanks to diligent research by my 2C1R Mrs Doreen Cooper of Vancouver