The 'Canterbury Tales' being written in the late 1300s is inseparable from its themes. Chaucer's London, emerging from the Black Death, was chaotic with social mobility and religious tension. That's why so much of the Tales feels like a snapshot of a world trying to figure out its new rules. The entire frame narrative of pilgrims traveling together, mixing nobles, clergy, merchants, and laborers, could only come from a period where those rigid feudal hierarchies were starting to crack.
You see the influence most in the tension between sacred and profane. On one hand, you have the 'Parson's Tale,' a straight-up sermon. On the other, you've got the 'Wife of Bath,' a character who uses scripture to argue for female sovereignty in marriage, and the 'Miller's Tale,' which is outright farce. Chaucer doesn't pick a side; he presents the whole noisy spectrum of a society where faith was absolute but human nature was messy and commerce was on the rise. The themes of hypocrisy, corruption (look at the Pardoner selling fake relics!), and the search for genuine virtue are direct products of a time when the Church's authority was being questioned in the streets, taverns, and yes, on pilgrim roads.