By the time that Charles II was restored to the throne in 1660, the major palace-fortresses in England that had survived slighting were typically in a poor state. As historian Simon Thurley has described, the shifting "functional requirements, patterns of movement, modes of transport, aesthetic taste and standards of comfort" amongst royal circles were also changing the qualities being sought in a successful castle. Palladian architecture was growing in popularity, which sat awkwardly with the typical design of a medieval castle. Furthermore, the fashionable French court etiquette at the time required a substantial number of enfiladed rooms, in order to satisfy court protocol, and it was impractical to fit these rooms into many older buildings. A shortage of funds curtailed Charles II's attempts to remodel his remaining castles and the redesign of Windsor was the only one to be fully completed in the Restoration years.