Became Queen when she was 6 days old after her father King James V of Scotland died.  

Following her marriage to The Earl of Bothwell after the death of her second husband in suspicious circumstances, Mary faced opposition from the Scottish nobles and was forced to abdicate.  She was imprisoned in lochleven Castle in 1567 and her son James was made king.   The following year she escaped and fled to England where she hoped to seek reuge from her cousin Queen Elizabeth I.  She was however imprisoned as the English Queen saw her as a threat to the throne.  

She was held prisoner for 19 years before being executed for corresponding with Anthony Babington who was plotting to depose Queen Elizabeth I.