A ring called the “Friday Ring” is listed among the jewels of Charles V of France (1337–1380), in the inventory made in 1379. This had on either side a double black cross in niello work, and was set with a cameo bearing a crucifix and the figures of the Virgin Mary, St. John and two angels. The name was derived from the fact that the king wore this ring every Friday, doubtless in memory of the Crucifixion, which took place on that day.[282] There is also mention of another ring, set with a large ruby, “the form of a halfbean. This is the ruby which belonged to St. Louis (1215–1270), and which has always been guarded successively by the kings of France.”[283] There seems to be some likelihood that this was the highly prized ruby lost by King John II about 1357, and in this case it must have been restored to the French treasury. Still another ring was set with a large ruby, called the “ruby de la Caille,” which had formerly belonged to the dukes of Brittany and had been given to King Charles by Monseigneur d’Anjou. A note to this inventory informs us that the term “ruby d’Alexandrie,” so often met with in old French lists of jewels, denotes a ruby bought in Alexandria, where many of the finest precious stones from the East were dealt in during medieval times.[284] The battlefield of Agincourt, in the department of Pas-de-Calais, not far removed from the trenches of the Anglo-French army in the great war of to-day, was visited in 1815 by General Sir John Woodford, who was serving with the Grenadier Guards. Hoping to unearth a few relics of the famous battle he had some excavations made, and his efforts were rewarded by the discovery of several knightly rings inscribed with mottoes or posies. About 1850 one of these rings, which had probably been worn by a French noble, was shown at a meeting of the London Archæological Institute. The battle of Agincourt, where the French army was decisively defeated by Henry V of England, was fought October 25, 1415, on the day of Sts. Crispin and Crispian, and inspired Shakespeare with the following proud lines addressed by the English king to his soldiers: And Crispin Crispian shall ne’er go by From this day to the ending of the world, But we in it shall be remembered.