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Turning the handle of one of these keys shoved through the door activated the bolt and pulled it out of the way to unlock the door or pushed it into the keeper to lock it.
Romans combined both Egyptian and Greek locks, and also invented the padlock, which became a great favorite since it ended the burden of carrying large sickle keys hooked over the shoulder.
First Skeleton Key
Lack of pockets in Roman togas mothered the invention of a ring key designed to be carried slipped over a finger. The first skeleton key soon followed.
Another lock making its appearance in the ancient world was the warded lock, still used today, although advised only to assure privacy and not security. Inserted into the keyhole, the key cannot be turned to open the lock unless special individulaized slots have been cut in it, allowing it to swing past
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