Lady Charlotte Guest (1812-1895) was a remarkable figure of the nineteenth-century British literary landscape, known for her pioneering work in the translation and popularization of Welsh medieval texts. Born Charlotte Elizabeth Bertie, she was well-educated for a woman of her time, fluent in numerous languages, and developed an abiding interest in Welsh language and culture after her marriage to John Josiah Guest, a Welsh ironmaster. Lady Guest's most laudable literary achievement is her translation of 'The Mabinogion,' a collection of medieval Welsh tales, which she published in seven volumes between 1838 and 1845. Her translation was the first to make these foundational stories of Celtic mythology accessible to a broader English-speaking audience, thereby establishing the tales as an essential part of the British literary canon. Lady Guest's work on 'The Mabinogion' is characterized by its scrupulous attention to detail and an earnest effort to stay true to the spirit of the original texts, earning her a distinguished place in the field of translation. A keen scholar and a patron of the arts, her contributions extended beyond literature; she was also active in the spheres of education and women's rights. The impact of Lady Guest's scholarship is enduring, and her legacy cementorialized in the preservation and appreciation of Welsh cultural heritage.