Frederick Maitland, sixth son of the Earl of Lauderdale, who assumed the additional name of Makgill.

The eldest son of this marriage, Charles Maitland-Makgill of Rankeilour, was married in August, 1794, to Mary, daughter of David Johnstone of Lathrisk.

Their eldest son, David Maitland-Makgill Crichton of Rankeilour, was born in 1801, and succeeded his grandmother in 1827.

"[2] In 1839, David Maitland Makgill was served 'heir of line' to the Viscountcy of Frendraught,[2] but was not entitled to claim the title for the following reasons: “The fourth viscount was the legitimate holder of the title, and it was attainted in his person.

And even though it had, there would have to be a petition presented to the King asking him to restore the forfeited title, which has not been in abeyance, but actually extinct since 1690.”[2] The Shield of Viscount Frendraught was quartered, first and fourth Argent, a lion rampant Azure; second and third Argent, a saltire and chief Azure; surtout Azure, thee mullets Argent within a bordure Or.