Letter 1: to Margaret Knight Caetani, Duchess of Sermoneta, of 16 April 1871.
Letter 2: to Margaret Knight Caetani, Duchess of Sermoneta, of 12 May 1871.
At the end of July 1871 Edward Lear visited the Caetani in Frascati, here are the diary entries for the visit.
Edward Lear, View of the Castello Caetani and the hill-town of Sermoneta (1872).
Letter 3: to Ada Bootle-Wilbraham Caetani, Princess of Teano of 1 March 1872.
Letter 4: to Margaret Knight Caetani, Duchess of Sermoneta of 21 November 1872.
Letter 5: to Ada Bootle-Wilbraham Caetani, Princess of Teano of 16 December 1872.
For information on the Knight family: Rob Wilson-North, John Knight of Wolverley and Simonsbath: An Outline Biography (Exmoor National Park. Historic Environment Report Series 25), 2017.