Invasions and battles pockmark the history of Wales. Invaders from the Romans, through to the Saxons and the Normans eyed-up the Welsh countryside and set off over the River Severn to see what they could claim. Impressive, rugged castles dotted around the country mark attempts by the invaders to keep the locals in check. Welsh historical heroes include King Arthur of the roundtable fame (also claimed by the Cornish), who features in ancient Welsh document as an emperor and war hero, as well as Owen Glendower (Owain Glyndwr) who featured in Shakespeare's Henry IV and waged battles against the English, claiming right to the title Prince of Wales. After winning a series of battles, and signing an allegiance with France, he drew the wrath of the English king, who clamped down on the Welsh, banning gatherings of people and Welsh men from holding office. Glyndwr's period of glory eventually came to an end when the forces of Henry V took back the castles and stronghold's the Prince of Wales had gained.
Non-conformist religion (particularly the Baptists and Methodists) marked the rise of Welsh nationalism in the 19th century. The non-conformists broke-off from the official state religion (Anglican) and taught the Welsh language at Sunday schools. The industrial revolution left a heavy mark on Welsh history, transforming the countryside and the workforce from having a focus on agriculture to coal mining and iron work. It also attracted immigration into Wales, boosting the population.
The University of Wales was established in 1893, and the national library and museum both received their royal charters in 1907. From 1999, an elected Welsh assembly was established in Cardiff, with powers devolved from Westminster. The Welsh authority has quickly established an independent frame of mind, taking a different route from English policies on some issues, most famously free prescriptions and university tuition fees.