Alexander Macdonell and over five hundred Roman Catholic highlanders leave Scotland to settle in Glengarry County, Ontario.

Bishop Alexander Macdonell was the first Roman Catholic bishop of Kingston, Upper Canada.

The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.27 to 1.41 billion baptized Catholics worldwide as of 2025. It is among the world's oldest and largest international institutions and has played a prominent role in the history and development of Western civilization. The Church consists of 24 sui iuris (autonomous) churches, including the Latin Church and 23 Eastern Catholic Churches, which comprise almost 3,500 dioceses and eparchies around the world, each overseen by one or more bishops. The pope, who is the bishop of Rome, is the chief pastor of the church.

Glengarry County, an area covering 288,688 acres (1,168 km²), is a county in the province of Ontario, Canada. It is still inhabited by the descendants of 18th and early 19th-century Scottish Highland pioneer settlers from Lochaber, was historically a Gàidhealtachd community, and Canadian Gaelic language revival efforts are currently taking place there. Glengarry County consists of the townships of North Glengarry and South Glengarry. It borders the Saint Lawrence River to the south, the county of Stormont and City of Cornwall to the west, the province of Quebec to the east, and the United Counties of Prescott-Russell to the north.