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?
Treason in Arthurian legend:  It would be the common laws of this time period which would most directly influence those customary in King Arthur’s court — assuming its existence is founded in more than the legends and fables of medieval romances.
i don't know