Sorry for not replying earlier, but I was away on my honeymoon in Australia !!
Unfortunately, I don't think this Archibald Devlin is the same one as mine. My Archibald was married to a Mary McVey in about 1840 ( although I don't know for sure that was his only marriage)and research has shown that most probably he was a farmer who lived in Ballynagowan, Drumcree, County Armagh. He had at least one son, John Devlin (b1846-1850ish, my Great great Grandfather) and a daughter Margaret.
The Griffith's valuation of Ireland, carried out 1850-1860 ish has 6 entries for Archibald Devlins, three of which are in Tyrone. However, the three land holdings are right next to each other so it may just have been one person.
About a year ago I actually got to look at the parish register for Arboe, County Tyrone and I remember finding the entry for your Archibald and his marriage to Mary Daly.
Sorry, I'm waffling a bit. To get to the point, my best guess that the six entries in Griffith's valuation represented three, or a maximum of four actual Archibald Devlin. Given that the name Archibald was very uncommon amongst Roman Catholics, it wouldn't surprise me if they were related somehow, but I can't see any way of proving it !