On This Day (20 April) in 1578, Lady Mary Grey, youngest daughter of Henry Grey, 1st Duke of Suffolk and his wife Frances Brandon, and sister to Lady Jane Grey and Katherine Grey, and widow of Sir Thomas Keyes, died at her London home, in the parish of St Botolph's-without-Aldgate.

Frances Brandon, Duchess of Suffolk, had survived the events of Jul 1553, those being the attempts to place Lady Jane Grey on the throne...