[1] He became a protégé of Bishop Hugh MacDonald, vicar apostolic of the Highland District for the underground Catholic Church in Scotland, and, when his family emigrated to Prince Edward Island in 1772, 13-year-old Angus stayed behind to study for the Roman Catholic priesthood at the clandestine minor seminary at Buorblach near Morar.

MacEachern, who would later be recognized as firmly placing Catholic roots in the colony as well as throughout the Maritimes, travelled endlessly in the area as a priest.

[3] In 1816, while serving as priest in Charlottetown, MacEachern was advised by a visiting bishop from Quebec to build a church in the city and dedicate it to St. Dunstan, the Archbishop of Canterbury.

In 1819, MacEachern became Vicar General for most of the Maritimes as well as becoming a bishop, and by the 1820s he was convinced that the only way to renew the area's religious beliefs was independence from the neglectful Archdiocese of Quebec.

[4] Located in his large home in St. Andrew's, PEI, the first Catholic College in the Atlantic provinces offered preliminary training for seminarians.