Uther Pendragons willingness to give his son Arthur to Merlin in exchange for spending just one night with Igraine reflects the idea of

courtly love
chivalry
"contemptu mundi"
NoNE OF THE ABOVE

This confuses me, I don't understand why he gave his child up, I don't think it would fall under chivalry because that's the nights moral code, the mundi is contempt for the world. I was thinking none of the above but I am not sure.

It depends on the version of Arthur you read.

http://en.wikipedia.org/wiki/Igraine

It is difficult to accept any of the first three answers: If Lust were there, I could buy that. But the versions of the stories varies.

I would go with none of the above on that particular question. Uther was in "lust".

To understand Uther Pendragon's willingness to give his son Arthur to Merlin in exchange for spending one night with Igraine, we need to delve into the Arthurian legend and its various interpretations.

In the Arthurian legend, Uther Pendragon, the father of Arthur, was infatuated with Igraine, the wife of Duke Gorlois. Uther desired Igraine so strongly that he made a deal with Merlin, a powerful sorcerer. Merlin used his magic to transform Uther to look like Gorlois, and Uther spent the night with Igraine, ultimately conceiving Arthur.

Uther's actions in giving up his son can be seen as a reflection of the concept of "contemptu mundi" or "contempt for the world." This idea suggests that individuals are willing to sacrifice worldly possessions, including family and personal relationships, for spiritual or higher pursuits. Uther, driven by his desires and ambitions, was willing to give up his own son for the chance to be with Igraine, representing a disregard for the normal bonds and responsibilities of family.

Therefore, the correct answer to your question would be "contemptu mundi," reflecting Uther's willingness to sacrifice his son for his own desires.

It's important to note that the Arthurian legend has been interpreted and adapted in various ways throughout history, and different interpretations may emphasize different themes. This particular explanation aligns with some interpretations of Uther's character and motivations.