RootsChat.Com

I realize I'm coming to this a little late, but I hope the thread isn't yet considered completely dead.

I came across it when googling "Innocent O'Callaghan" as I try to do every couple of years. Evidently I've let my routine slip of late.

Anyway, if you haven't yet chanced on this, from John Boyle O'Reilly's The Poetry and Song of Ireland, you might find it interesting:

THOMAS O'DONNELL O'CALLAGHAN was born in 1847, in the town of Kil-
mallock, county Limerick, Ireland, and came to this country in 1866. When
but in his teens he was identified with the Fenian movement in Ireland
and was the Kilmallock correspondent, under the nom de plume "Libertas."
of the Fenian organ, the Dublin Irish People, which was suppressed by
the government. He also wrote some patriotic poetry for the Dublin Irish-
man of those days. Since coming to the United States, Mr. O'Callaghan has
written extensively for the various New York Irish American weeklies and for
the New York dailies, more especially the Daily News, to which he has contri-
buted many of his most characteristic verses. Mr. O'Callaghan is descended
on the mother's side from the celebrated Shawn O'Dhear an Glanna (anglice,
John O'Dwyer of the Glen) known as the Poet Huntsman, who flourished in
Munster in the seventeenth century. His father, Innocent O'Callaghan, was
a celebrated scholar and mathematician of Munster, whose name was familiar
in his day throughout Ireland, and who died in 1868. He is a cousin of the
Irish poet, Doctor Robert Dwyer Joyce.

It's that R.D. Joyce who I'm researching, so if you can cast any light on the whole rat's-nest, in addition to the considerable information already in this thread, I'd be very interested.