William Cecil, 1st Baron Burghley (sometimes spelled Burleigh) (13 September 1520 - 4 August 1598),KG was an English statesman , the chief advisor and good friend of Queen Elizabeth I for most of her reign (17 November 1558-24 March 1603), twice Secretary of State (1550-1553 and 1558-1572) and Lord High Treasurer from 1572