To defend their territory. and impose a point of power.
you would need about 99 people to build a castle.
sand.
You need craftsman for the design of the castle.
A baron could only build a castle if he'd been ordered by the king to do so.
On a hill!!
Go to the seashore and build a sand castle. Then try to build a water castle and/or an air castle. That should tell you everything you need to know to answer this question.
a long time!!
because they wanted to
you need to make sure you have enough guards to guard the castle its around 20
it is quicker and easier to build the castle.
The cost to build a castle can vary greatly depending on the size, location, materials, and design. However, it can range from millions to tens of millions of dollars.
It took about 456 people to build a castle