Catherine Douglas

:"For the wife of Michael Douglas, see Catherine Zeta-Jones."

Catherine Douglas, later Catherine ("or Kate") Barlass, was a historical figure involved in the assassination of King James I of Scotland on February 20, 1437. She was a lady-in-waiting to his queen, Joan Beaufort.

Legend has it that during the King's stay at a Dominican chapterhouse in Perth, a group of men led by Sir Robert Graham came to the door searching for the King in order to kill him. The King's Chamberlain, Robert Stuart, aware of the plot against his life, had taken the precaution of removing the bolt from the door of the room in which James and his queen were staying.

Catherine sprang to the door and placed her arm through the staples to bar the assassins' entrance [John Stewart Of Ardvorlich: The Grahams, W. & A. K. Johnston & G. W. Bacon, Ltd (1958), Page 9.] . However, they forced the door open anyway, breaking Catherine's arm, and discovered and killed the King. From that point on, according to the story, Catherine took the surname of "Barlass".

Dante Gabriel Rossetti recounted the story of Catherine Douglas in verse in 1881, under the title "The King's Tragedy". This poem contains the line "Catherine, keep the door!" - possibly the origin of the idiomatic phrase "Katy, bar the door!" (a warning of the approach of trouble).

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