The Assassin Order, also known as the Assassin Brotherhood, Liberalis Circulum (Circle of Liberals) during the time of the Roman Empire, or Hashshashin during the Middle Ages, was an organized order of assassins and sworn enemies of the Templars, against whom they fought a continuous, recondite war throughout the entirety of recorded human history. Whereas the Templars sought to save humanity from itself by controlling free will, the Assassin Order fought to ensure the survival of freedom, as it allowed for the progression of new ideas and the growth of individuality.
The Assassins, if not the Order itself, have existed since at least 456 BCE, throughout the Roman Empire, the Middle Ages, the Renaissance, the Industrial Revolution and into the Modern era.