Agnes Keith, Countess of Moray

Agnes Keith, Countess of Moray was a Scottish noblewoman. She was the wife of James Stewart, 1st Earl of Moray, regent of Scotland and the illegitimate half-brother of Mary, Queen of Scots, making her a sister-in-law of the Scottish queen. As the wife of the regent, Agnes was the most powerful woman in Scotland from 1567 until her husband's assassination in 1570.