Final answer:
The code of behavior in question is the chivalric code, which is based on Geoffrey of Monmouth's work and exemplifies the ideals of honor, bravery, and gallantry that influenced knightly conduct in medieval times.
Step-by-step explanation:
The question refers to a code or behavior that stems from the work of Geoffrey of Monmouth, particularly the chivalric code associated with the legend of King Arthur and the Knights of the Round Table. This chivalric code emphasized honor, bravery, and gallantry towards women, shaping medieval knightly conduct. Geoffrey of Monmouth played a significant role in popularizing the Arthurian legends through his work 'Historia Regum Britanniae' (History of the Kings of Britain), which included tales of King Arthur and his knights. The stories of the Round Table's Gawain, Galahad, and Lancelot are prime examples of chivalric ideals in action. These stories and others influenced the medieval concept of chivalry, a system of values that advocated for the protection of the weak, respect for women, and the pursuit of honor both on and off the battlefield.