Moran was born at
Leighlinbridge,
County Carlow,
Ireland, on 16 September 1830. His parents were Patrick and Alicia Cullen Moran. Of his three sisters, two became nuns, one of whom died nursing cholera patients. His parents died by the time he was 11 years old. In 1842, at the age of twelve, he left Ireland in the company of his uncle,
Paul Cullen, rector of the
Irish College in Rome. There Moran studied for the priesthood, first at the
minor seminary and then at the major
seminary. Moran was considered so intellectually bright that he gained his
doctorate by
acclamation. By twenty-five he spoke ten languages, ancient and modern. He focused on finding and editing important documents and manuscripts related to Irish ecclesiastical history. Some editions of his works remain important source materials to this day. He was appointed vice-rector at the Irish College and also took the chair of Hebrew at
Propaganda Fide. He was also some-time vice-rector of the
Scots College in Rome. In 1866 Moran was appointed secretary to his mother's half-brother, Cardinal Paul Cullen of Dublin. Moran was also appointed professor of scripture at
Clonliffe College, Dublin. He founded the "
Irish Ecclesiastical Record" (on which he later modelled the "
Australasian Catholic Record"). In 1869 he accompanied Cardinal Cullen to the
First Vatican Council, a council also attended by Melbourne's then-first archbishop,
James Alipius Goold. According to Michael Daniel, it is generally agreed that the definition of the Catholic doctrine of papal infallibility was based on Cullen's proposal, and Ayres suggests that there is strong evidence that Cullen's proposal was largely drafted by Moran. While in Rome and Ireland he was very active politically in opposing English Benedictine plans for monastic foundations undergirding the Catholic Church in Australia. ==Bishop of Ossory==