The Eve of Saint (St.) Mark is an English language poem by John Keats.
[1] It is related to his earlier poem written in the same year, The Eve of Saint Agnes.
Keats also mentions the legend in his fairy story, the Cap and Bells; here too, the young woman is named Bertha.
[3] Keats wrote this poem in February 1819, after The Eve of Saint Agnes but before La Belle Dame sans Merci.
[2] It opens, "Upon a Sabbath-day it fell;" and describes the streets of a cathedral town as the residents head to Evensong.