Wooden tower on a raised mound (motte) with enclosed courtyard (bailey); primary defense for feudal lords.
Durable stone fortifications; tall central keep with thick walls, arrow slits; improved defense against siege engines.
Multiple rings of walls and towers; layered defense forcing attackers through successive barriers.
Continuous defensive wall with towers and gatehouses; centralized control, efficient defense.
Fortified towers combining residence and defense; common in Scotland and Ireland where stone was scarce.
Decline of feudal warfare; elaborate facades, grand interiors, pleasure gardens; transition to opulent palaces.
Romantic revival of medieval styles; built for aesthetics, as private homes or tourist attractions.
Castles evolved from purely military structures to multifunctional complexes reflecting changing technology, society, and taste.