Noted Anachronisms.
Reading edition
Shakespeare makes Lear, an early Anglo-Saxon King, speak of not wanting spectacles, which were not known until the fourteenth century. Cannon were first used in the year 1346, but in relating Macbeth's death, in 1054, and King John's reign in 1200, he mentions cannon. In his Julius Cæsar, he makes the "clock" strike three.
Schiller, in his "Piccolomini," speaks of a "lightning-conductor" as existing about 150 years before its invention.