This manuscript illumination from the Estoire del Saint Graal shows Joseph’s last act of entrusting the Holy Grail containing the blood of Jesus Christ to his nephew, Alain, to keep it safe and bring the Grail to England.
In this manuscript image made for Jacques d'Armagnac, the Knights of the Round Table are gathered at their seats to celebrate the Pentecost when they all have a vision of the Grail being held by two angels at the center of the table.
The author of the passage is Walther Map, also known by his French name Gautier Map, a Welshman born in England circa 1140. He was a notable clergyman and writer and wrote histories in Latin. The passage above tells the story of how Sir Galahad was…