The story of Mary Jones and her Bible inspired the founding of the British and Foreign Bible Society. Mary Jones (16 December 1784 – 28 December 1864) was a Welsh girl who, at the age of fifteen, walked twenty-six miles barefoot across the countryside to buy a copy of the Welsh Bible from Thomas Charles because she did not have one. Rev. Thomas Charles then used her story in proposing to the Religious Tract Society that it set up a new organisation to supply Wales with Bibles.
Together with the Welsh hymnwriter Ann Griffiths (1776–1805), Mary Jones had become a national icon by the end of the nineteenth century, and was a significant figure in Welsh nonconformism.
Mary Jones was from a poor family, the daughter of a weaver, who lived at Llanfihangel-y-pennant, Abergynolwyn, at the foot of Cader Idris near Dolgellau. She was born in December 1784. Her parents were devout Calvinistic Methodists, and she herself professed the Christian faith at eight years of age. Having learned to read in the circulating schools organised by Thomas Charles, it became her burning desire to possess a Bible of her own. The nearest copy was at a farm two miles distant from her little cottage, and there was no copy on sale nearer than Bala – 26 miles (42 km) away; and it was not certain that a copy could be obtained there. Welsh Bibles were scarce in those days. Having saved for six years until she had enough money to pay for a copy, she started one morning in 1800 for Bala, and walked the 26 miles over mountainous terrain, barefoot as usual, to obtain a copy from Rev. Thomas Charles, the only individual with Bibles for sale in the area. According to one version of the story, Mr. Charles told her that all of the copies which he had received were sold or already spoken for. Mary was so distraught that Charles spared her one of the copies which was already promised to another. In another version, she had to wait two days for a supply of Bibles to arrive, and was able to purchase a copy for herself and two other copies for members of her family. According to tradition, it was the impression that this visit by Mary Jones left upon him that impelled Charles to propose to the Council of the Religious Tract Society the formation of a Society to supply Wales with Bibles.