John of Salisbury, English bishop and associate of St. Thomas a Becket and Nicholas Breakspear (the only Briton to be elected pope, as Adrian IV), died on October 25, 1180--as the Bishop of Chartres. According to the Catholic Encyclopedia, he witnessed the martyrdom of St. Thomas a Becket:
He was thus brought into intimate relations with princes and popes, especially with Henry II and his chancellor, Thomas à Becket, and with Pope Adrian IV, also an Englishman. In defending the rights of the Church, he incurred the kings displeasure in 1159 - when his forced seclusion enabled him to complete his two principal works the "Policraticus" and the "Metalogicus", both dedicated to Thomas à Becket - and again in 1163, when he was obliged to quit England. The next six years he spent with his friend Peter of La Celle, now Abbot of St. Remigius at Reims. Here he wrote "Historia Pontificalis". Thomas à Becket, who had succeeded Theobald as Archbishop of Canterbury in 1162, was soon obliged to follow John into exile. The latter steadily endeavoured to promote the cause of peace hetween the English king on the one hand and his archbishop and the Holy See on the other. Apparent success crowned those efforts in 1170, when both exiles returned. In a few months (29 Dec.) John witnessed the tragic murder of the saintly archbishop in the cathedral at Canterbury. In 1174 John became treasurer of Exeter cathedral. In 1176 he was appointed Bishop of Chartres. He attended the Third Lateran Council in 1179 and died the next year. He was interred in the monastery of St. Josaphat, near Chartres.
image of the martyrdom of St. Thomas a Becket from John of Salisbury's Life of Becket. More about how John of Salisbury promoted the cause for canonization and veneration of St. Thomas a Becket here. Among the ways he promoted veneration of Becket at Chartres, besides preserving drops of the martyr's blood that had fallen on him, John of Salisbury had a stained glass window panel created that contains events from Becket's life .
Summarizing his life and works, Peter Coffey comments:
The significance of Bishop John of Salisbury's devotion to St. Thomas a Becket meant that even after King Henry VIII had destroyed the martyr's shrine and tomb, there were still relics and devotion to Becket on the Continent. Like the Augustinians in Paris at the Abbey of St. Victor, the relics and stained glass of Chartres continued the veneration of the "holy, blissful martyr" in the Catholic Church.
Photo of Chartres (c) Mark Mann. Not be to used without permission.