Mold Castle, on Bailey Hill in the town of Mold

Mold, Flintshire

Mold is a town in Flintshire, North Wales, on the River Alyn. It is the administrative seat of Flintshire County Council, and was also the county town of Clwyd from 1974 to 1996...

, Flintshire

Flintshire

Flintshire is a county in north-east Wales. It borders Denbighshire, Wrexham and the English county of Cheshire. It is named after the historic county of Flintshire, which had notably different borders...

, Northeast Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

, was an earthwork

Earthworks (engineering)

Earthworks are engineering works created through the moving or processing of quantities of soil or unformed rock.- Civil engineering use :Typical earthworks include roads, railway beds, causeways, dams, levees, canals, and berms...

 motte and bailey

Motte-and-bailey

A motte-and-bailey is a form of castle, with a wooden or stone keep situated on a raised earthwork called a motte, accompanied by an enclosed courtyard, or bailey, surrounded by a protective ditch and palisade...

 fortress

Fortification

Fortifications are military constructions and buildings designed for defence in warfare and military bases. Humans have constructed defensive works for many thousands of years, in a variety of increasingly complex designs...

 probably founded by Robert de Montalt around the year 1140. In 1147 it was captured by Owain Gwynedd

Owain Gwynedd

Owain Gwynedd ap Gruffydd , in English also known as Owen the Great, was King of Gwynedd from 1137 until his death in 1170. He is occasionally referred to as "Owain I of Gwynedd"; and as "Owain I of Wales" on account of his claim to be King of Wales. He is considered to be the most successful of...

. It switched hands on several occasions before a long period under Welsh control during the reign of Llywelyn ab Iorwerth. It remained a defensive structure up until the 13th century.