 Major developments in 19th-century Welsh literature include Lady Charlotte Guest's translation of the Mabinogion, one of the most important medieval Welsh prose tales of Celtic mythology, into English.1885 saw the publication of "Rhys Lewis" by Daniel Owen, credited as the first novel written in the Welsh language.The 20th century experienced an important shift away from the stilted and long-winded Victorian Welsh prose, with Thomas Gwynn Jones leading the way with his 1902 work "Ymadawiad Arthur".