Richard Lambart, 4th Earl of CavanPC (I) (died 10 March 1742) was an Irish peer.
He was the second but eldest surviving son of Charles Lambart, 3rd Earl of Cavan, and Castilina Gilbert, daughter of Henry Gilbert of Kilminchy and sister of St Leger Gilbert MP. He inherited the Earldom of Cavan in 1702, his eldest brother Charles having predeceased their father.
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