[87] Date uncertain.
[88] Date uncertain.
[89] A specimen of an early speaking-tube exists, connecting the room said to have been occupied by Isabella with the old brewhouse, now a tavern, by means of which Mortimer was wont to communicate with his mistress. The castle stands upon a mount of 280 feet, sheer rock, and the brewhouse is at its base. A peculiarity of the tube, bored through the live rock, is an elbow-joint, which is a puzzle to scientists.
[90] Date uncertain.
[91] Often erroneously given as 1370, neglecting the fact that, by the old manner of reckoning, the year began on March 25th.
[92] Date uncertain.
[93] By the French it is claimed that Jean Charlier de Gerson was the author of de Imitatione Christi, usually attributed to Thomas à Kempis.