The second Baronet represented Grantham and Newark in the House of Commons.
Their arms were azure, on a chief or, a semi-lion rampant issuing gules.
He was the founder of the Doncaster Amalgamated Collieries and also represented Mansfield in the House of Commons as a Liberal.
[2] The arms for the extant baronetcy are azure on a pale argent three lozenges sable, issuant from a chief engrailed or a demi-lion rampant gules.
The heir presumptive is his younger brother Richard Barry Markham (born 1954).