Eleazar Roberts (15 January 1825 - 6 April 1912) was a Welsh musician, translator, writer and amateur astronomer. Roberts family moved to Liverpool in England while he was an infant, but despite this he retained a strong link to his country of birth and was a fluent Welsh speaker. He wrote for several Welsh journals and travelled Wales setting up music classes. He is most notable for pioneering the tonic sol-fa method of sight-singing in Wales, which in turn led to the strengthening of the practice of congregational singing.
Roberts was born in Pwllheli, Caernarfonshire in 1825 to John and Margaret Roberts, but only two months after his birth, the family moved to Liverpool. He grew up in Liverpool and was educated at several schools in the town including the Liverpool Institute High School for Boys. At the age of 13 he found work in a solicitor's office. In 1853 he became a full member of staff in the office of the clerk to the Liverpool magistrates before reaching the position of chief assistant to the clerk to the stipendiary magistrate. He retained the role of chief assistant until his retirement in 1894, and the following year he was made a justice of the peace. He died in 1912 and was buried at Anfield Cemetery.
Roberts wrote for several Welsh journals throughout his life, most notably Yr Amserau, for which he wrote a weekly article under the pseudonym 'Meddyliwr'. As well as his weekly article he was also published in Y Drysorfa, Y Geninen and Y Traethodydd. He wrote two books in the English language, Owen Rees: a story of Welsh life and thought (1893) a novel about life in a Welsh community in Liverpool, and a biography on Welsh politician Henry Richard.
Roberts travelled throughout Wales establishing singing classes. He was also a pioneer of the tonic sol-fa method of sight-singing in Wales, having adapted and translated into Welsh, the works of John Curwen. His most important publication on the topic was Llawlyfr y Tonic Solffa, a handbook which was designed to help in the teaching of the tonic sol-fa method. Other musical works in Welsh from Roberts include Llawlyfr Caniadaeth, Llawlyfr i ddarllen yr Hen Nodiant and Hymnau a Thonau.
Roberts was an amateur astronomer, but is notable in Welsh astronomy for translating The Solar System by prominent Scottish astronomer, Dr Thomas Dick, from English into the Welsh language. He wrote many essays in Welsh journals on astronomy, including several pieces in Y Traethodydd under the title 'The Telescope and its Discoveries'. He had an observatory in Hoylake and was friends with prominent astronomer Dr Isaac Roberts, who like Roberts was born in Wales, but grew up in Liverpool.
- Honourable Society of Cymmrodorion (1959). "Roberts, Eleazer". Dictionary of Welsh Biography. Retrieved 29 May 2010.
- Davies, John; Jenkins, Nigel (2008). The Welsh Academy Encyclopaedia of Wales. Cardiff: University of Wales Press. p. 581. ISBN 978-0-7083-1953-6.
- "History of the World, Modulator (tonic sol-fa)". BBC. 2010. Retrieved 29 May 2010.
- Davies, John; Jenkins, Nigel (2008). The Welsh Academy Encyclopaedia of Wales. Cardiff: University of Wales Press. p. 766. ISBN 978-0-7083-1953-6.
- Eleazer Roberts. "Llawlyfr y Tonic Solffa". National Library of Wales. Retrieved 29 May 2010.
- Rev. J. Silas Evans translated by Rhys Morris. "An English translation of Chapter 24 of Seryddiaeth a Seryddwyr". Retrieved 29 May 2010.