Marjorie Bruce

Marjorie Bruce or Marjorie de Brus was the eldest daughter of Robert the Bruce, King of Scots by his first wife, Isabella of Mar, and the founder of the Stewart dynasty. Her marriage to Walter, High Steward of Scotland gave rise to the House of Stewart. Her son was the first Stewart monarch, King Robert II of Scotland. Her widowed father later married Elizabeth de Burgh.

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Source: Wikipedia