Robert Devereux, 3rd Earl of Essex

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The Right Honourable The Earl of Essex KB PC
Portrait of Robert Devereux 3rd Earl of Essex
Born	(1591-01-11)11 January 1591
Died	14 September 1646(1646-09-14) (aged 55)
Education	Eton College
Alma mater	Merton College, Oxford
Title	Earl of Essex
Spouse(s)	Frances Howard Elizabeth Paulet
Parent(s)	Robert Devereux, 2nd Earl of Essex Frances Walsingham

Robert Devereux, 3rd Earl of Essex, KB, PC (/ˈdɛvəˌruː/; 11 January 1591 – 14 September 1646) was an English Parliamentarian and soldier during the first half of the 17th century. With the start of the Civil War in 1642, he became the first Captain-General and Chief Commander of the Parliamentarian army, also known as the Roundheads. However, he was unable and unwilling to score a decisive blow against the Royalist army of King Charles I. He was eventually overshadowed by the ascendancy of Oliver Cromwell and Thomas Fairfax, and resigned his commission in 1646.