Newcastle Castle

The Castle, Newcastle, or Newcastle Castle is a medieval fortification in Newcastle upon Tyne, England, built on the site of the fortress that gave the City of Newcastle its name. The most prominent remaining structures on the site are the Castle Keep, and the Black Gate, its fortified gatehouse.

Use of the site for defensive purposes dates from Roman times, when it housed a fort and settlement called Pons Aelius, guarding a bridge over the River Tyne. Robert Curthose, eldest son of William the Conqueror, in 1080 built a wooden motte and bailey style castle on the site of the Roman fort. Curthose built this 'New Castle upon Tyne' after he returned south from a campaign against Malcolm III of Scotland.

Source: Wikipedia