Codes of Chivalry

The Song of Roland serves as an important source of the codes of chivalry which many stories of King Arthur and the Knights of the Round Table live by. The song suggests 17 codes ranging from "protect the weak and the defenseless" to "despise pecuniary reward". These sacred oaths outlined the mannerisms and conduct of the Middle Ages and Medieval Era and are displayed in Medieval Romantic literature such as Sir Gawain and the Green Knight. Although other sources of these codes have been found such as the Duke of Burgandy in the 14th Century, the core principles (bravery, courtesy, honor, and gallantry toward women) remain consistent. This moral system, also known as Charlemagne's Code of Chivalry, was composed between 1098-1100 and describes the betrayal of Count Roland and his eventual death. These moral codes embody Roland's loyal character and the meaning of chivalry. 

To fear God and maintain His Church

To serve the liege lord in valour and faith

To protect the weak and defenceless

To give succour to widows and orphans

To refrain from the wanton giving of offence

To live by honour and for glory

To despise pecuniary reward

To fight for the welfare of all

To obey those placed in authority

To guard the honour of fellow knights

To eschew unfairness, meanness and deceit

To keep faith

At all times to speak the truth

To persevere to the end in any enterprise begun

To respect the honour of women

Never to refuse a challenge from an equal

Never to turn the back upon a foe

Source: http://www.middle-ages.org.uk/knights-code-of-chivalry.htm