One of Bellingham’s ancestors, of Northumbrian origin, crossed the Pennines to marry an heiress in the reign of Edward II, and another member of the family represented Cumberland in 1449.
Bellingham did not stand at the general election in 1628, but served again as junior knight of the shire in both the Short and Long Parliaments of 1640. Having tried to avoid commitment in the Civil War, he eventually sided with Charles, attended the Oxford Parliament, and commanded a regiment against the invading Scots in the aftermath of Marston Moor.
