What were the reasons why motte and bailey castles were turned into stone?

Motte and bailey castles were transitioned into stone for several key reasons: durability and defense were paramount, as stone structures offered greater protection against sieges and attacks compared to wooden ones, which were more susceptible to fire and decay. Additionally, the establishment of more permanent settlements and the rise of feudalism necessitated stronger fortifications to assert control and deter enemies. Stone castles also symbolized power and prestige, reflecting the wealth and status of their owners in a growing medieval society.