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In page Hammer throw:

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The exact origins of the hammer throw are a mystery to modern historians.[citation needed] According to legend, at the Tailteann Games in Tara, Ireland, as far back as 2000 BC the Celtic warrior Culchulainn took a chariot axle with a wheel still attached and spun it around and hurled it.[1] The wheel was later replaced by a rock with a wooden handle attached.[1] A sledgehammer began to be used for the sport in Scotland and England during the Middle Ages.[1] In current times, the hammer has changed to the more modern 7.26 kg ball attached to a wire and a handle, but the Scottish Highland Games still feature the older style of hammer throw with the rock and the solid wood handle.