

According to Sir Samuel Egerton Brydges’ Peerage of England (1812), ii, 24, Lord Albemarle Bertie, the immediate brother of the 3rd Duke of Ancaster and Kesteven, died unmarried 16 May 1765.
Sir Albemarle Bertie, 1st Bt was born 20 Jan 1755 and died 24 Feb 1824, while his sis Diana’s date of birth is unknown. She probably was not long born before or after Albemarle. It is annoying that there is no ready source that identifies the mother of either. I looked through History of Parliament Online and other places.
The other problem is that the Dukedom of Ancaster and Kesteven and the Earldom of Ancaster and other titles became EXTINCT in 1804 upon the death of the 4th Duke of Ancaster and Kesteven, except the Earldom of Lindsey, which devolved upon his 3rd cousin.
Due to this, Debrett’s Peerage for 1809, 1814, 1816, 1820, 1822 or 1825 do not list the title. Even if they did, I do not think they would show the illegitimate connection (most works of this period avoid doing this unless the personage is specially “exalted” enough).
Debertt’s Baronetage 1824, ii, 1132 actually lists Sir Albemarle being succeeded by his son, Lyndsey James Bertie and shows his date of birth as 29 Oct 1795. It also lists him as Lt in the 12th (Princess of Wales’s) Regiment of Light Dragoons. However the entry for the baronetcy is not present in the 1835 edition.
This mystery is solved by looking through (what aptly Paul is looing for) The Waterloo Roll Call (1904, 2nd edn) by Charles Dalton. It thoroughly lists those KIA at Waterloo along with biographical details and other information. Here is a link to it: https://www.gutenberg.org/files/51143/51143-h/51143-h.htm#Page_75
On p 75, it states “Lindsay James Bertie, K.”. The abbreviation “K.” means KIA. I do not know if there are other Debrett’s editions between 1824 and 1835, otherwise we would know for sure if the error was caught (later on) or they realized later and quietly retracted/amended the article.
An interested note in the Waterloo Roll Call, p 93 is that it lists Maj Philip Zachariah Cox 23rd LD has having married 17 Feb 1817, Louise, “youngest dau. of Adm. Sir Albemarle Bertie, Bart.” and died 24 January 1811.
[S.S.]
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