Vale of Glamorgan History Timeline

3000 BC	Neolithic burial chambers were built at Tinkinswood and St Lythans.
1600 BC	Bronze age activity around Cowbridge.
500 BC	Iron Age hill forts were built throughout South Wales, including the one at Dinas Powys.
50 BC to 50 AD	Caer Dynnaf Hillfort was built near Llanblethian, and was subsequently used throughout the Roman occupation.
3rd - 4th Centuries	The Romans constructed what is believed to be holiday accommodation, or a section of a chain of defences, at Cold Knap in Barry.
500	Saint Illtud founded a church and religious school at Llantwit Major. His pupils included Saints David, Patrick and Gildas.
c600	Dinas Powys hillfort was reused and became a key European trading centre.
c800	The Vikings used Flat Holm island as a mooring point.
9th-10th Centuries	Llantwit Major's early Christian memorial stones were erected.
Late 11th Century	Iestyn ap Gwrgan, the last native ruler of Morgannwg, reinforces Dinas Powys Castle against the Norman invaders.
1093	Reginald de Sully constructed Sully Castle.
12th Century	Dunraven and Penllyn castles were built.
1102	St. Quentins Castle at Llanblethian was constructed.
1116	Ogmore Castle was founded. 1141 Ewenny Priory, a Benedictine institution, was founded by Maurice de Londres.
13th Century	Penmark and St Donats Castles were built.
1200	Fonmon Castle was built.
1245	Tal-y-Fan Castle was built; Cowbridge was established by Richard de Clare.
1262	Wallston Castle was founded.
14th Century	Llandough and Llanmaes Castles were built, and a medieval village was at Cosmeston.
1316	A castle was founded at Barry.
1376	Old Beaupre Castle was built.
15th Century	Coed-y-Cwm Castle was founded.
1404	Peterson Castle was constructed.
1536	Act of Union between the English and the Welsh.
1540	Sir Rice Mansel added to Beaupre Castle.
1608	Cowbridge Grammar School was founded.
1777	The Methodist John Wesley preached at St. Illtud's church.
1812	The estates of Barry and Porthkerry were bought by Sir Samuel Romilly.
1859	Tidal harbour on the River Ely opened at Penarth.
1865	Penarth dock opened.
1878	The railway arrived in Penarth.
1884-92	Two docks were built between Barry Island and the mainland to serve the growing coal trade.
1888	Turner House gallery was built by James Pike Thompson.
1893	Dyffryn House was built.
1897	The first radio message was transmitted to Flat Holm.
1925	Sir Randolph Hearst bought and restored St. Donats Castle.
1960	Atlantic College was founded at St. Donats castle.
1970s	Cosmeston Medieval Village was discovered again by archaeologists.