AT-1861
Grail Mythology
Why Ancient Inquiry uses this citation here
Chrétien de Troyes's unfinished late-twelfth-century romance in a stable bibliographic record; earliest secure major Grail narrative baseline, where the grail is a processional serving object rather than yet the fully developed Last Supper chalice.
What this usage does not establish
Bibliographic verification does not by itself establish that the full text was read.
Open topic