David Davis, Maesyffynnon, (1821- 1884), son of David Davis, Blaengwawr was a prominent Welsh coal owner and public figure. He built upon the work of his father and expanded the family's industrial holdings in the Aberdare and Rhondda valleys. He had two daughters, Mary and Catherine. Mary married H.T. Edwards, vicar of Aberdare and later Dean of St Asaph and Catherine married Sir Francis Edwards.
The family business, built up by his father, was based on the Aberdare Valley, and a number of collieries were opened south of Aberdare, such as that at Abercwmboi. During his father's last years, the family became involved in the early exploitation of the coal reserves of the neighbouring Rhondda Valleys, with the Davis family's operations being concentrated on Ferndale in the Rhondda Fach. Despite the huge loss of life at Ferndale in 1867 he was regarded as a good employer.
During the strikes of the 1870s, Davis was among the most conciliatory among the coal owners, endeavouring to being disputes to an end.
The collieries of David Davis and Sons remained open throughout the lock-out of 1875. He later became vice-chairman of the South Wales Conciliation Board, chaired by H. H.Vivian.
A wealthy man, he had quarrying ventures in Merioneth, and became high sheriff of the county in 1869. He built a house at Arethog, between Dolgellau and Barmouth where his wife died in 1880.
Davis was from an early age more interested in public life than his self-made father had been. As early as 1847 he was involved in public meetings called in response to the 1847 Education Reports. He became actively involved in the public life of the Aberdare Valley, as a member of the Aberdare Local Board of Health and Aberdare School Board. His educational interests also made him aa generous supporter of the University colleges at Aberystwyth and Cardiff.