|SOME NOTES ON MEDIEVAL ENGLISH GENEALOGY|
Volume 8, page 22:
He [Robert (Bertie), Earl of Lindsey (d. 1701)] m. 1stly (pub. of banns 19 Nov. to 3 Dec. 1654, at St. Margaret's, Westm.), Mary, 2nd and yst. da. and coh. of John MASSINGBERD, of London ... She d. s.p.m., after Sep. 1655.
Albemarle, the Earl's 5th and yst. son by his 1st wife, is referred to in 1709 (Idem [Hist. MSS. Com., Ancaster MSS.], p.438); his portrait being at Swinstead House, Jan. 1726 (p. 458).
Adrian Channing, in June 2002, pointed out this contradiction, and suggested that Robert's first 5 sons were children of his second marriage.