Science Fair Project Encyclopedia
A geasa is a vow or obligation placed upon a person (usually a hero, such as Cuchulainn) in Irish mythology. Traditionally, the doom of the hero comes about due to his violation of such geasa, usually by accident.
There is a considerable similarity between geasa (which are a phenomenon of Irish Celtic mythology) and the foretold deaths of heroes in Welsh mythology. This is not surprising given the close origins of all the variants of Celtic mythology.
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