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
History of the Welsh language speaking Cumbric, and those in the south-west, speaking what would become Cornish, and so the languages diverged. The Book of Aneirin ("Canu Aneirin", c. AD 600) and the Poetry, or Book, of Taliesin ("Canu Taliesin") belong to this era, though both also include some poems originally written in Primitive Welsh. Middle Welsh () is the label attached to the Welsh of the 12th to 14th centuries, of which much more remains than for any earlier period. This is the language of nearly all surviving early manuscripts of the "Mabinogion", although the tales themselves are certainly much older. It is also