by St. Patrick on the banks of Loch Scola, and they had remained
Christians of the old Irish Church, which appears to have been peculiar
in its mode of tonsure, and of keeping Easter (and, since the twelfth
century, firm adherents to the religion of the Pope, till Dowell
O'Reilly, Esq., the father of the present head of the name, quarrelling
with Father Dowling, of Stradbally, turned Protestant, about the year
1800).

"The ancestor, after whom they took the family name, was Reillagh, who
was chief of his sect, and flourished about the year 981.

"From this period they are traced in the Irish Annals through a
long line of powerful chieftains of East Breifny (County Cavan), who
succeeded each other, according to the law of Tanistry, till the year
1585, when two rival chieftians of the name, Sir John O'Reilly and
Edmund O'Reilly, appeared in Dublin, at the parliament summoned by
Perrot. Previously to this, John O'Reilly, finding his party weak, had
repaired to England, in 1583, to solicit Queen Elizabeth's interest,
and had been kindly received at Court, and invested with the order of
Knighthood, and promised to be made Earl, whereupon he returned home
with letters from the Queen to the Lord Deputy and Council of Ireland,
instructing them to support him in his claims. His uncle, Edmund, of
Kilnacrott, would have succeeded Hugh Connallagh O'Reilly, the father of
Sir John, according to the Irish law of Tanistry, but he was set aside
by Elizabeth's government, and Sir John set up as O'Reilly in his place.
Sir John being settled in the chieftainship of East Breifny, entered
into certain articles of agreement with Sir John Perrot, the Lord
Deputy, and the Council of Ireland, whereby he agreed to surrender the
principality of East Breifny to the Queen, on condition of obtaining it
again from the crown _in capite_ by English tenure, and the same to be