Worship of the lingam, or phallus, is a central part of the cult of Shiva but dates from the time of the Indus Valley Civilization. One of Shiva's several aspect is as a god of fertility, and in his early form as Rudra, he was closely linked to the ancient Lord of the Beasts who was worshipped in the Indus Valley around 2000 B.C. The most prominent evidence of the cult of Shiva found from the Indus Valley Civilizations sites is probably the famous seal, known as the Pashupati Seal, discovered at Mohenjo Daro, depicting a seated, possibly ithyphallic and tricephalic, figure with a horned headdress, surrounded by animals. It is purported to be one of the earliest depictions of Shiva.
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