Wilmot was invited to accompany the party of Stephen Moore, 2nd Earl Mount Cashell, and his wife on a grand tour of the continent.

The Mount Cashells entertained lavishly, especially during the first nine months in Paris, and through them she met Napoleon Bonaparte, and made friends with the Austrian painter Angelica Kauffman.

She also met the French diplomat and politician Charles Maurice de Talleyrand-Périgord, and the Irish republican Robert Emmet fleetingly.

She recounted her meeting in Rome with the English aristocrat Frederick Augustus Hervey, and her audience with the Pope, Pius VII.

[2] Martha was in the country as a favourite of Princess Dashkov, one of the key figures of the Russian Enlightenment and a close friend to Catherine the Great.

Wilmot left Moscow on 4 July 1807, a combination of passport problems, wars and storms at sea, resulted in delays and in her reaching Yarmouth on 7 September 1807, and returning to Ireland in October 1807.

The family made transcriptions of the letters; the collection belonging to Martha were donated to the library of the Royal Irish Academy by Elisabeth van Dedem Lecky, the historian and writer.