Lord Mount Cashell acquired numerous other siblings-in-law, doubly closely bonded through the two marriages, including Henry, Edward, and Robert King.
Wilmot wrote extensive letters home, some of which were published in 1920 as An Irish peer on the continent (1801–1803) being a narrative of the tour of Stephen, 2nd earl Mount Cashell, through France, Italy, etc.
In the French capital, they met Napoleon, the radical English parliamentarian Charles James Fox and, "up half a dozen flights of stairs, in a remote part of the town", Thomas Paine.
[8] In June 1802 the Cashells had another son, Richard Francis Stanislaus Moore, and Wilmot records that its godparents were William Parnel, "the Polish Countess Myscelska", and the American minister (presumably Robert Livingston, who was in post 1801–1804).
In Rome they were in the company of the Swiss painter, and founding member of the Royal Academy in London, Angelica Kaufmann; the epicure Lord Bristol, Bishop of Derry (who, in the Volunteer crisis of 1783 is said to have imagined himself King of Ireland);[9] the Cardinal Duke of York, brother to the Young Pretender, Charles Edward Stuart; and the Pope, Pius VII, who in his gardens "very gallantly pull’d a hyacinth and gave it to Lady Mount Cashell".