[1] By the death of his father in 1653 Fleming inherited considerable estates in the neighbourhood of Rydal, for which he paid heavy fines to the parliament.
He was a constant correspondent of Secretary Joseph Williamson: his letters, which went to the Public Record Office, afford a lively picture of the state of affairs in Cumberland and Westmorland during the latter half of the 17th century.
He regretted the release of George Fox in 1666 as likely to discourage the justices from acting against the Quakers, and gave credence to reports of their burning "steeple houses".
[2] Fleming is said by Thomas Wotton[3] to have been an assistant in the annotation of William Camden's Britannia; no acknowledgment, however, is to be found in the preface to Edmund Gibson's edition.
[1] Fleming married in 1655 Barbara, eldest daughter of Sir Henry Fletcher of Hutton, Cumberland, who was killed at Rowton Heath on the side of the king in 1645.