September 27 - Francis Homfray leases a mill from Anthony Bacon of Cyfarthfa ironworks. (Under the terms of a new Parliamentary Act, Bacon, as an MP, is disqualified from holding government munitions contracts.)
William Owen Pughe and Robert Hughes (Robin Ddu yr Ail o Fôn) meet in London.
David Davis (Dafis Castellhywel) settles in Castellhywel.
Arts and literature
New books
William Gilpin - Observations on the River Wye and several parts of South Wales, etc. relative chiefly to Picturesque Beauty; made in the summer of the year 1770
date unknown - Lady Catherine Hamilton, formerly Catherine Barlow of Colby, heiress to an estate in south Pembrokeshire which passed to her nephew Charles Francis Greville.