Comprises:

Folder MSBY-11: letter from [William] King, [later Earl of Lovelace], to Mary, announcing the birth of a son and heir, 12? [May 1836]; letters received by Woronzow Greig from [the Earl of] Lovelace, concerning the illness of his wife, his relationship with Lady Byron, and financial and other matters, Jul-Dec 1852

Folder MSBY-12: letters and related papers received by Woronzow Greig from S. Lushington regarding unspecified business concerning Lady Byron and Lord Lovelace, 5-23 Dec 1852 and n.d.

Folder MSBY-13: account of the illness of Lady Lovelace sent by Dr West to Woronzow Greig at the request of Lord Lovelace, 20 Aug 1852; press cuttings relating to the death and funeral of Lady Lovelace, 29 Nov and 3 Dec 1852; letters from A. Margaretta Burr to Woronzow Greig offering sympathy and support and apparently referring to her friendship with Lady Lovelace, 2 and 10 Sep 1852

Folder MSBY-14: notebook containing an account by Lord Lovelace of his wife's illness and events during 1851 and 1852, with a note by Lady Byron on the opening page explaining how the volume came into her possession, and with instructions to [Woronzow] Greig loosely inserted at the front, all originally in an envelope addressed to Woronzow Greig and labelled 'Journal, Surrey Lodge May 21st 1853, Lady Noel Byron called and delivered this to me'; envelope as above with separate label 'Lady L's illness and death....', (listing items now contained in folders MSBY-13 and 14)

Folder MSBY-15: sketch, apparently of Lord Byron's monument, n.d. [c. 1852], with notes on burial in the hand of Woronzow Greig, 19 Aug 1852

Folder MSBY-16: letters from J Gore Browne to the Earl and Countess of Lovelace regarding his marriage, 4 Apr [1851] and n.d. [1851?]; letter from James Williams to the Countess requesting the payment of a debt, 16 Jan 1852

Folder MSBY-17: transcript of an extract from a letter from Charles Babbage to Dr Lushington regarding papers and letters received by Babbage from the Countess of Lovelace, n.d. [c.Mar 1853]

Folder MSBY-18: letters from Woronzow Greig to his mother regarding the clearance of 'the house at Chelsea', 10 May 1840 (incomplete), and describing a visit to Lady Byron, during which she had expressed her gratitude to Mary for her good influence on her daughter, Ada, 4 May 1847

Folder MSBY-19: letters from Annabella [King] (later Annabella Blunt), to Agnes Greig and Martha Somerville, 1866-1872; letter from Byron [King] to his father from HMS Victory, 6 Dec 1852

Folder MSBY-20: letters and papers relating to Lady Byron and the Countess of Lovelace including: