The Markham Baronetcy, of Sedgebrooke in the County of Lincoln, was created in the Baronetage of England on 15 August 1642 for Robert Markham. The Markhams were a prominent family who took their name from Markham, Nottinghamshire and whose lineage extends to Sir Alexander de Markham, who was constable of Nottingham Castle during the time of King Henry III. The second Baronet represented Grantham and Newark in the House of Commons. The third Baronet sat as Member of Parliament for Grantham. The baronetcy became extinct on the death of the fourth Baronet in 1779. Their arms were azure, on a chief or, a semi-lion rampant issuing gules.
