who were the first stone castle builders in medieval europe?

The First Stone Castle Builders in Europe were 8th-c Muslims

Is the claim that the Normans popularized the castle in Europe during the Middle Ages a myth? And were the Normans the first medieval people in Europe to give an active role to castles rather than just a passive role? To answer these questions, we will look at a medieval castle in Europe, namely the Castle of Gormaz, built by Muslims in Spain, see if it was used passively or actively, and compare it to a few Norman castles.