English noblewoman who held the throne of England and Ireland from July 10 to July 19, 1553, earning the nickname "Nine Days' Queen." Her reign was part of an unsuccessful bid to prevent the accession of the Catholic Mary I of England, known at the time as Mary Tudor. She and her husband were executed the following year by Mary I for high treason.
She received a humanist education, studying Latin and Greek along with Hebrew and Italian. Through her father's influence and that of her tutors, she became a committed Protestant.
She was initially pardoned by Mary I and was imprisoned in the Tower of London, but was executed after she became viewed as a threat to the throne.
She was the eldest daughter of Henry Grey, 1st Duke of Suffolk, and his wife, Frances. She was also the great-granddaughter of Henry VII and was a first cousin once removed of Edward VI. She married Guildford Dudley in May 1553.
Her tragic story was depicted in the writings of many famous authors, including Mark Twain's The Prince and the Pauper.