creator of Sherlock Holmes), Sir Walter Scott, J. M. Barrie, Robert Louis Stevenson and the poet Robert Burns. More recently Hugh MacDiarmid and Neil M. Gunn contributed to the Scottish Renaissance, with grimmer works from Ian Rankin and Iain Banks. Scotland's capital, Edinburgh, was UNESCO's first worldwide City of Literature. Welsh literature includes Britain's oldest known poem, Y Gododdin, which was composed most likely in the late 6th century. It was written in Cumbric or Old Welsh and contains the earliest known reference to King Arthur. The Arthurian legend was further developed by Geoffrey of Monmouth. Poet Dafydd ap Gwilym (fl. 1320–1370) is regarded as one of the greatest European poets of his age. Daniel Owen is credited as the first Welsh-language novelist, publishing Rhys Lewis in 1885. The best-known of the Anglo-Welsh poets are Dylan Thomas and R. S. Thomas, the latter nominated for the Nobel Prize in Literature in 1996. Leading Welsh novelists of the twentieth century include Richard Llewellyn and Kate Roberts. Irish writers, living at a time when all of Ireland was part of the United Kingdom, include Oscar Wilde, Bram Stoker and George Bernard Shaw. There have been many authors whose origins were from outside the United Kingdom but who moved to the UK. These include Joseph Conrad, T. S. Eliot, Kazuo Ishiguro, Sir Salman Rushdie and Ezra Pound. Philosophy The United Kingdom is famous for the tradition of 'British Empiricism', a branch of the philosophy of knowledge that states that only knowledge verified by experience is valid, and 'Scottish Philosophy', sometimes referred to as the 'Scottish School of Common Sense'. The most famous philosophers of British Empiricism are John Locke, George Berkeley and David Hume; while Dugald Stewart, Thomas Reid and William Hamilton were major exponents of the Scottish "common sense" school. Two Britons are also notable for the ethical theory of utilitarianism, a moral philosophy first used by Jeremy Bentham and later by John Stuart Mill in his short work Utilitarianism. Music Various styles of music have become popular in the UK, including the indigenous folk music of England, Wales, Scotland and Northern Ireland. Historically, there has been exceptional Renaissance music from the Tudor period, with masses, madrigals and lute music by Thomas Tallis, John Taverner, William Byrd, Orlando Gibbons and John Dowland. After the Stuart Restoration, an English tradition of dramatic masques, anthems and airs became established, led by Henry Purcell, followed