The concept of treason can be dated back to the early Roman republic, but was defined by nebulous criteria, it would be the common laws of this time period which would most directly influence those customary in the court of King Arthur, a legendary British leader who, according to medieval histories and romances, led the defence of Britain against which invaders in the late 5th and early 6th centuries AD?
King Arthur King Arthur is a legendary British leader who, according to medieval histories and romances, led the defence of Britain against Saxon invaders in the late 5th and early 6th centuries AD. The details of Arthur's story are mainly composed of folklore and literary invention, and his historical existence is debated and disputed by modern historians. The sparse historical background of Arthur is gleaned from various sources, including the "Annales Cambriae", the "Historia Brittonum", and the writings of Gildas. Arthur's name also occurs in early poetic sources such as "Y Gododdin".
Brutus of Troy Brutus, or Brute of Troy, is a legendary descendant of the Trojan hero Aeneas, known in medieval British history as the eponymous founder and first king of Britain. This legend first appears in the "Historia Britonum", an anonymous 9th-century historical compilation to which commentary was added by Nennius, but is best known from the account given by the 12th-century chronicler Geoffrey of Monmouth in his "Historia Regum Britanniae". Notwithstanding this, he is not mentioned in any classical text and cannot be considered to be historical.