Letter listing for 1800–1809
- Richard Brinsley Sheridan to Richard Wilson, 28 February 1809
- Richard Brinsley Sheridan to George Legge, 3rd earl of Dartmouth, 1 March 1809
- Hester Lynch Piozzi [formerly Mrs Thrale; née Salusbury] to Sir John Williams, Lady Margaret Williams and Eleanor Williams [née Hughes], 3 March 1809
- Hester Lynch Piozzi [formerly Mrs Thrale; née Salusbury] to Sir John Salusbury Piozzi Salusbury [née Piozzi], 5 March 1809
- Jeremy Bentham to Aaron Burr, 6 March 1809
- Richard Brinsley Sheridan to Aaron Graham, John Hosier and William Houlston, c. 7 March 1809
- Richard Brinsley Sheridan and Thomas Sheridan to Aaron Graham, John Hosier and William Houlston, 7 March 1809
- Aaron Burr to Jeremy Bentham, 8 March 1809
- Hester Lynch Piozzi [formerly Mrs Thrale; née Salusbury] to Sir John Salusbury Piozzi Salusbury [née Piozzi], 10 March 1809
- Richard Brinsley Sheridan to William Taylor, 10 March 1809
- Hester Lynch Piozzi [formerly Mrs Thrale; née Salusbury] to Sir John Salusbury Piozzi Salusbury [née Piozzi], 13–14 March 1809
- Hester Lynch Piozzi [formerly Mrs Thrale; née Salusbury] to Sir John Salusbury Piozzi Salusbury [née Piozzi], 18 March 1809
- Hester Lynch Piozzi [formerly Mrs Thrale; née Salusbury] to Hester Maria Elphinstone, Viscountess Keith [née Thrale], 19 March 1809
- Marie Thérèse Caron de Beaumarchais [née Willermawlaz] to [unknown], 22 March 1809
- Hester Lynch Piozzi [formerly Mrs Thrale; née Salusbury] to Lady Margaret Williams, 26 March 1809