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They were particularly favored because they were portable.
They operated by keys that turned, screwed, and pushed.
However, when Alexander the Great failed to undo the Gordian Knot, he cut it swiftly with his sword, giving us the expression, "to cut the Gordian Knot," meaning a bold, decisive action, effective when milder measures fail.
Locks from the Orient Brass and iron padlocks found in Europe and the Far East were popularized by the Romans and the Chinese.
Security was a Guardian Angel In India, in the days of the Emperor of Annam, valuables were sealed into large blocks of wood, which were placed on small islands or submerged into surrounding pools of the inner courts of the palace.
Here, they were protected by the royal "guardian angels," a number of crocodiles kept on starvation rations so they were always hungry.
The legitimate approach to the treasure was to drug or kill the crocodiles.The pegs at the bit end of the key correspond to the bars, or the tumblers, in the bolt.