The very 1st castles built were called "Mote and Bailey" structions. These were very simple and somewhat primitive buildings compared to the massive stone castles we see today. None survive today as they were originally built of wood which quickly rots away.
However, the concept of the mote and bailey was used to build many of the castles we know today. The "mote" was a simple tower built on top of hill of packed earth. Surrounding this structure was the "bailey" which was an open courtyard surrounded by a high wooden fence of pallisade.
The tops of the wooden stakes that make up the pallisade would often be sharpened into a point to make climbing over them hazardous. Sometimes a dry or wet moat might also be built around the entire structure.
Entrance into the mote and bailey was by either a single gate or drawbridge.
The first castle ever built is unknown. The first recorded castle is called Doue-la-Fontaine in Loire Valley in northern France. Doue-la-Fontaine may have been the first castle ever built but, as said before, it is uncertain.
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It is the Prague Castle and it was built 870 - 890 A.D.
Newcastleunder -Lyme got its name because the Normans built a castle. I don't know why it was called the 'new' castle, maybe there was a older castle or fortress nearby.
1457...when a castle was being built in that area.It was then called Edo.In 1868 the emperor moved into the castle and changed the name to Tokyo.
Rochester Castle Leeds Castle
Larnach Castle, built in 1871 by William Larnach
Larnach castle
Nonsuch Castle.
Robert II,Duke of Normandy built the New Castle
It is called Buda Castle
It is called Clovis Castle.