The concept of security is as old as human civilization. The search for security for oneself from death and bodily harm is innate in human nature as part of its biological self which is common to all living beings. In the beginning it was intuitionist but gradually rational measures were sought to safeguard oneself. Thus began the thinking on security. The term security became popular during the Roman Empire (see the chapter by Arends in this volume.). In Latin, securus represents a state of psychological status of mind to secure oneself against enemies. It was used more for the emperor and his family than for the public. Security of the emperor was considered as security of his empire.