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.
the castles that were back in medieval started in 2012 :)
They started to build in 1903 and finished in 1914.
They started to build it in 1998 and finished in 2000.
they started to build it last year and finish it yesterday
According to this site(http://www.middle-ages.org.uk/famous-castles-of-the-middle-ages.htm), less then a year ("within a twelvemonth").
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
Joseph Stalin started the Five Year Plans.
Most began as wooden mott and bailey types and eventually evolved into stone. The wood structures were very prone to fire and when gun powder was introduced to Europe the wood couldn't withstand the assault from cannon fire.I'm not sure but i think castles were built of of mud and stone but when that didn't work they were built out of wood. When the they found that the wood caught fire they started to build castles out Stone. After a while people destroyed castles using Gun Powder. Then after this the castles lost there usefulness. By Hope Newton year 7
castles changed as more and better siege weapons were being devoleped which were better at destroying bigger better castles were needed they started of as tiny motte and bailey castles but turned out to be massive concentric castles
The first year people started to use Morse code was 1844.
1847
Stone keep castles were built in 11th - 13th centuries.