Saoirse Ronan will star in Mary, Queen of Scots, Digital Spy said citing Deadline.

The actress has signed on for the lead role in the Michael Hirst-penned biopic.

Working Title is currently seeking a director for the period drama.

Mary's life was a mess of intrigue that saw her abdicate her throne after marrying her late husband's supposed murderer.

Seeking refuge with her cousin, Elizabeth I of England, she was imprisoned and later executed. Her son James I later became king of Great Britain and Ireland.

Hanna star Ronan will next appear in Violet & Daisy, Byzantium and The Host.