John Field (26 July 1782, baptised 30 September 1782 – 23 January 1837) was an Irish pianist, composer, and teacher. Field is best known as the inventor of the nocturne, but there is evidence to suggest that this is a posthumous accolade. He is mentioned in passing in War and Peace when Countess Rostova calls on the Rostov household musician to play her favourite nocturne.He was born in Dublin into a musical family, and received his early education there, in particular with the immigrant Tommaso Giordani. The Fields soon moved to London, where Field studied under Muzio Clementi. Under his tutelage, Field quickly became a famous and sought-after concert pianist. Together, master and pupil visited Paris, Vienna, and St. Petersburg. Ambiguity surrounds Field's decision to remain in the former Russian capital, but it is likely that Field acted as a sales representative for the Clementi Pianos.