Lady Jane Grey (1536/1537 – 12 February 1554) is Queen regnant of England and Ireland after the death of King Edward VI from 10 until 19 July, 1553.

Her claim to the throne derives from Edward VI's will, his "Device of the Succession", and from her descent from Mary Tudor, Queen of France, which makes her a great-niece of Henry VIII.

Residing in the Tower of London during her short reign, she never leaves the premises again.

Her execution in February 1554 is caused by her father's involvement in Wyatt's rebellion against the rule of Queen Mary I.

Lady Jane Grey's rule of less than two weeks is the shortest rule of England in its history.

Those historians that consider her a monarch have taken either the day of her proclamation as queen, 10 July, or that of her predecessor's death, 6 July, as the beginning.

Hence her popular names of "The Nine Days' Queen" or, less commonly, "The Thirteen Days' Queen".

She is sometimes reckoned the first Queen regnant of England.

Lady Jane has an excellent humanist education and a reputation as one of the most learned women of her day.

A committed Protestant, she is posthumously regarded not only as a political victim but also as a martyr.