Celtic tribes, known to exist in Britain as early as 2,000 B.C., were unified by a priesthood known as Druids. Druids are one of the earliest known peoples to have used crystals in divination. Later, during central Europe's Medieval Period (500 - 1500 AD), seers, wizards, sorcerers, psychics, gypsies, fortune tellers, and all other types of diviners also used crystals to "see" into the past, present, or future.
When the technique of scrying is used with crystals, or any transparent body, it is known as crystallomancy.
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