i think that it was the 18th century
medieval Europe
Stone keep castles were built in 11th - 13th centuries.
Castles were built in England during the Middle Ages and the first ones were built in the 11th century. Most of the Castles remaining in England are dated between the 13th and 15th centuries.
Early castles were built of earth and wood covered with plaster. The Normans were the first to make widespread use of masonry in the British Isles in the 11th and 12th centuries.
Historically, it would seem that the eleventh through sixteenth centuries were the "Golden Age" of castle building in Europe. Some were built before or after that time, but most date to that 500 year period.
There are a huge amount of castles all around Europe and they have been built by many different people, so there is no one answer to your question.
Castles were built in various styles and forms throughout history, depending on the time period and region. Some common types include motte-and-bailey castles, concentric castles, and stone keep castles. Motte-and-bailey castles were early medieval fortifications consisting of a wooden or stone keep built on a raised earthwork called a motte, with an enclosed courtyard known as a bailey. Concentric castles were developed in the 12th and 13th centuries and featured multiple layers of defensive walls and towers. Stone keep castles, also known as Norman castles, were constructed primarily in the 11th and 12th centuries and featured a central stone tower or keep surrounded by walls and other structures.
Castles were built out of stones or bricks.
Castles were built out of stones or bricks.
Castles were built primarily for defense.
There have been many castles on the site. The latest one was built about 2-3 centuries ago when the previous one got burnt down. It was built in the style of a fairytale castle
he built woodern castles He built these castles in England for better defence.