In 1066 by the Normans
All castles that exist today are made from stone because stone lasts for a long time. In total there were three types of castles: Stone Keep castles (Stone castles), Motte and Bailey castles and Concentric castles. The Stone Keep castles were made out of stone along with the Concentric Castles and still stand to this day as great monuments. The Motte and Bailey castles, however were made out of wood and have all rotted away to leave none left standing today.
Stone or square keep castles were first built in Medieval England by William the Conqueror. Stone keep castles were the natural extension of motte and bailey castles. Motte and bailey castles were only temporary features (though many mottes exist to this day) while stone keep castles were built to last. (this was copyed and pasted off the website below.)Go to www.historylearningsite.co.uk/stone_keep_castles.htm for more information.
William The Conqueror. Aka William of Normandy.
1847
A castle which have a series of different sized walls surounding them
· A stone castle would not rot whereas a Motte and Bailey would rot easily as it was made from wood. · Motte and Bailey castles could be knocked down with battering rams, but they would not penetrate a stone castle. · Stone castles had battlements which gave defenders something solid to hide behind, Motte and Bailey had no such thing. · The round towers on a stone castle were thought to bounce of any type of missile but they would destroy a stone keep. · Motte and Bailey castles were very prone to rotting and decay, but Stone castles would not rot or decay. · Stone Keeps could not be burnt down very easily as they were made of stone whereas Motte and Bailey castles could be incinerated very easily as they were made of wood. · Stone castles have high up towers enabling the defenders to fire arrows down at the enemy but the enemy could not fire back, Motte and Bailey castles do not have high enough towers to do this.
Stone castles were built in 1277 and usually had more that one wall, the inner wall being higher than the outer ones.
They were built in the year 1172
There is no particular year, but most castles had fires to keep warm. For more information on life in castles read this:http://www.castles.org/Kids_Section/Castle_Story/inside.htm
Top floor :- Areas of the Lord's family and guests. Lord's family sleeping quarters. 2nd :- The Great Hall Dinning Hall Ground :- Guard Room Chapel Underground :- Dungeon Storeroom Cellar More Dungeons Somewhere in the castle :- Spiral Staircase Small, long windows
No one really knows the exact date someone created a castle but obviously they were needed to keep towns safe so to answer your question the Normans invented building castles first by using wood and timber and then even after their the Norman invasion of Britain in 1066 they were still using wood and timber to create castles and then through necessity turned to stone castles.