Castles were not invented, but evolved from earlier designs, most notably the old Roman castra. The evolution included gradually developing the motte and keep on it. That being the case, we cannot point to a castle and say it was the first, or to a person and say that person built the first.
castle
Vladamir Petik, a Russian King in the medieval times built the first Motte and Bailey castles in France on his way home from a business meeting.
a CASTLE ??
Medieval Jesters traveled from castle to castle, in the Medieval town.
Windsor castle Lincoln castle Alnwick castle Leeds castle Norwich castle Nunney castle Yarmouth castle
This is because the keep itself is made out of Stone. they were built in medieval times.
Castle
Protection
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In the medieval period it was called a donjon. After the medieval period, when castles were no longer being built, the term used was "keep", a word that is widely used, incorrectly, today.
In the medieval times, they used moats as a defence against intruders.
The motte and bailey castle and the concentric castle.