Lord Grey de Wilton is now largely remembered for his memoir of his father, for participating in the last defence of Calais (1558), and for his involvement in the massacre after the Siege of Smerwick (1580) on Corca Dhuibhne in County Kerry.

Elizabeth I, however, restored the property forfeited by his father for his part in the Lady Jane Grey affair.

In 1580, he recruited a force of 6,000 and was sent as Lord Deputy of Ireland to quell the Second Desmond Rebellion, replacing the notoriously brutal Sir William Pelham.

Jane's parents were Sir Richard Morrison of Cashiobury, Hertfordshire (d. Strasbourg, 17 March 1556), and Bridget Hussey (c. 1526 – 13 January 1600/1601, bur.

It deals mainly with his father's military campaigns in Scotland and France, and has been highly praised by historians for the vivid first-hand account of the last days of English rule in Calais and Guisnes.