St. Margaret was the granddaughter of an English king. In 1070 she married Malcolm III of Scotland, and reigned as queen of that country for twenty-three years. She gave bountifully to the poor and saw that the laws of God and His Church were observed throughout her realm. Pope Innocent XII appointed June 10 for the observation of her feast. She was the guardian angel of her people, on account of which Clement X proclaimed her the patron of Scotland. She died in 1093.
(Source: The New Roman Missal by Father Lasance).