Daniel O'Leary was born in the County of Cork, Ireland in
1829. In 1846 at the age of 17 he married Catherine Walsh Sullivan who at 32 was 15
years his senior and had three children from a previous marriage.
While traveling in
Wales, their first son, Patrick is born on St. Patrick's Day, March 17, 1850. Two years
later they had their second and last child, son Bill who became sick at sea and perished
on the voyage to America. In 1853 they left Ireland and settled in Pittsburgh
where he died in 1899.