One of the most significant advantages of a Concentric Castle was that round towers could not be mined as readily. Larger castles can accommodate a larger number of defendants. An attacker might still be seen by defenders in a high number of towers once within the outer wall. However there are types of weapons that can destroy or severely damage large numbers of towers.
Another advantage is that they can easily be built outside city walls, which allows for more freedom in building locations. A final advantage is that they are easy to defend: only one gate needs to be opened for reinforcements to arrive. If the enemy approaches from another direction they will run into other towers guarding the rest of the castle. There is also no risk of fire spreading to adjacent buildings like there is with stone castles.
Disadvantages include difficulty in supplying the fortress with food and ammunition. The presence of so many soldiers inside the walls prevents them from helping their neighbors if it comes under attack themselves.
Concentrated castles are usually built by wealthy individuals or small kingdoms who want to show their status. They are most common in Asia where they often stand alone on an island.
In a nutshell: the benefits of concentric castles
Concentric castles were composed of stone and had two or more encircling walls around the center tower. The term "concentric" refers to "having a shared center," as in a circle within another circle. As a result, a concentric castle was similar to a castle within a castle. This made it extremely difficult for intruders to get access. There were three main types of concentric castles: those with just one wall (enclosure), those with two parallel walls (double enclosure), and those with several circles of defense (multiple enclosures).
People began building concentric castles in Europe during the 11th century. They were most common in France and Spain. Although they were built with good intentions, many people believed that they were unnecessarily complicated. Concentric castles were also expensive to build; therefore, they were only used by the rich or powerful.
In conclusion, concentric castles were very complicated to build and not easy to attack. Thus, they were only used by the rich or powerful.
Because of the many walls erected around the central tower, concentratic castles were difficult to conquer and penetrate. Moats, battlements, and gatehouses provided extra security. The overall effect was that a concentric castle was more difficult to attack than a linear one.
Concentric castles evolved in Europe around 1100. They replaced earlier, less secure linear fortifications. These older fortifications had been built by peasants who lacked metal tools. They used only natural materials available on site, such as trees for timber, soil for clay, or rocks for stone. So they built their forts in circles or lines, depending on the location. Sometimes they built them over old settlements or ancient roads.
In order to protect these forts, which were easily attacked, people built walled towns outside their range. These other towns became known as "satellites" because they circled the main fortress like planets orbit the sun. Each satellite had its own government and laws they could not violate so there would be no rebellion against the main fortress. If someone tried to break into one of these towns, its citizens would gather together their weapons and armor and rush out to fight off the attackers. This is why these early castles have always appeared to us to be harder to assault than modern ones. There were too many good fighters inside them!
Every aspect of its building was meant to ensure that the castle was as sturdy as possible and could withstand sieges that may last months. A significant innovation in castle building technology emerged in the late medieval period (about the 1300s): the concentric castle. Rather than placing the main defense system at one central point like most previous castles, the new design placed it at several points around the perimeter. This allowed the defenders to concentrate their firepower where it was most needed without exposing other parts of the fortress to attack.
Medieval castles were also very large structures, often covering hundreds of acres. They used up a lot of resources including stone, wood, and labor. As well, they usually didn't have any similar buildings on which to base their design decisions so they tended to be rather eccentric looking. All in all, they were huge projects that required much investment of time and money.
Renaissance-era cities offered many more opportunities for employment and therefore had more diverse populations. They also relied less on military force for their protection since they could not afford to build such big castles everywhere. Instead, they used police forces and city guards to handle crime and enforce laws.
Medieval cities were also very dirty places with lots of garbage scattered throughout them. They lacked modern sanitation practices so there was no way to get rid of everything that was thrown away.