Margaret de Clare, Baroness Badlesmere

Margaret de Clare, Baroness Badlesmere (ca. 1 April 1287 – 22 October 1333/3 January 1334, disputed) was a Norman-Irish noblewoman, suo jure heiress, and the wife of Bartholomew de Badlesmere, 1st Baron Badlesmere.

She was arrested and subsequently imprisoned in the Tower of London for the duration of a year from November 1321 to November 1322, making her the first recorded female prisoner in the Tower's history. She was jailed on account of having ordered an armed assault on Isabella of France, Queen consort of King Edward II of England. Before Margaret had instructed her archers to fire upon Isabella and her escort, she had refused the Queen admittance to Leeds Castle where her husband, Baron Badlesmere held the post of governor, but which was legally the property of Queen Isabella as part of the latter's dowry. Margaret surrendered the castle on 31 October 1321 after it was besieged by the King's forces using ballistas. Edward's capture of Leeds Castle was the catalyst which led to the Despenser War in the Welsh Marches and the north of England.

Upon her release from the Tower, Margaret entered a religious life at the convent house of the Minorite Sisters outside Aldgate. King Edward granted her a stipend to pay for her maintenance.

Margaret was born at an unrecorded place in either Ireland or England on or about 1 April 1287, the youngest child of Thomas de Clare, Lord of Thomond and Juliana FitzGerald of Offaly, and was a granddaughter of Richard de Clare, Earl of Hertford and Gloucester. She had two brothers, Gilbert de Clare, Lord of Thomond, and Richard de Clare, 1st Lord Clare, Lord of Thomond, who was killed at the Battle of Dysert O'Dea in 1318; and an elder sister, Maud, whose first husband was Robert de Clifford, 1st Baron de Clifford. Margaret had an illegitimate half-brother, Richard. Her parents resided in both Ireland and England throughout their marriage; it has never been established where Juliana was residing at the time of Margaret's birth although the date is known.