Robert Sidney, 3rd Earl of Leicester [E., 1618], married Lady Catherine Cecil, daughter of William Cecil, Earl of Salisbury.
Sources
Burke, Sir John Bernard, A Genealogical History of the Dormant, Abeyant, Forfeited, and Extinct Peerages of the British Empire (Name: Pall Mall; Location: London, England; Date: 1883), p. 525.
The Complete Peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, Extant, Extinct or Dormant, Los Angles Public Libary, 7:556-7.
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