The Decline of Chivalry and Sir Gawain and the Green Knight In the fourteenth century, chivalry was in decline due to drastic social and economic changes. Although feudalism-along with chivalry-would eventually fall for other reasons, including a decrease in cheap human resources due to a drop in population caused by plague epidemics and the emergence of a mercantile middle class, the Gawain author perceived a loss of religious values as the cause of its decline. Gawain and the Green Knight presents both a support of the old feudal hierarchies and an implicit criticism of changes by recalling chivalry in its idealized state