Ceredigion sources of income. Ceredigion's population at the 2011 UK census was 75,900. Its largest town, Aberystwyth, is one of its two administrative centres, the other being Aberaeron. Aberystwyth houses Aberystwyth University, Bronglais Hospital and the National Library of Wales. Lampeter is home to part of the University of Wales Trinity Saint David. Ceredigion has been inhabited since prehistoric times. A total of 170 hill forts and enclosures have been identified across the county and there are many standing stones dating back to the Bronze Age. Around the time of the Roman invasion of Britain, the area was between the realms
Welsh language to under 50 per cent in Ceredigion and Carmarthenshire for the first time. However, according to the Welsh Language Use Survey in 2013–15, 24 per cent of people aged three and over were able to speak Welsh. In 2018 a survey by the ONS suggested 29.3 per cent of the population of Wales were able to speak the language. Historically, large numbers of Welsh people spoke only Welsh. Over the course of the 20th century this monolingual population "all but disappeared", but a small percentage remained at the time of the 1981 census. Most Welsh-speaking people in Wales also speak