Peter Cleary, born 1821 - married Isabella Linsley in North-East England (Durham I believe). Evidence for him being from Kilmore is the 1881 E&W Census listing him (Peter Clarry
) as being born in Kilmoor, Ireland. And I think I've seen Rilmore somewhere too! I've seen others on Ancestry listing a James Cleary, born 1790 in County Clare as his father, but I haven't found documentary evidence of that.
There is a Kilmore in Co. Cavan. A parish and also the name of the entire diocese.
That your Peter Cleary ended up in Durham, might suggest mining - did he have such an association? There were mines in the vicinity of Co. Cavan, which might make a Cavan origin more likely if so. Downside is he would have been born before start of parish register.
There is also a Kilmore Catholic/civil parish in Co. Mayo, on the ocean.
Kilmore, Co. Wexford - A parish with fishing village and an agricultural area. Unlikely candidate for move to Durham? No sign of his baptism in parish registers.
Kilmore, Co. Clare - just a townland.