It's Dolly Pentraeth who was the last surviving Cornish speaker, I recognised the Cornish language which is very similar to Welsh and it can be seen in Mousehole Cornwall.
In 1860, Prince Lucien Bonaparte visited this locality in order to ascertain what yet remained of the Cornish language; while here, he, in conjunction with the vicar, inserted a small granite obelisk, surmounted with a Maltese cross, in the churchyard wall, inscribed as follows:—
Here lieth interred Dorothy Pentreath, who died in 1778, said to have been the last person who conversed in the ancient Cornish, the peculiar language of this county from the earliest records till it expired in the eighteenth century, in this parish of St. Paul. This stone is erected by the Prince Louis Lucien Bonaparte, in union with the Rev. John Garrett, vicar of St, Paul. June, 1860.
Honour thy father and thy mother, that thy days may be long in the land which the Lord thy God giveth thee.
I believe that Dolly used to charge the tourists 1d when they asked her to say something in Cornish and what she always said can be translated into English as "the cat has peed on the mat"
Exod. xx., 12.
Gwra perthi de taz ha de mam: mal de Dythiow bethewz hyr war an tyr neb an arleth de dew ryes dees.
Exod. xx., 12.