Guihomar IV, Viscount of Léon
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For other uses, see Guihomar of Léon (disambiguation).
Guihomar, Guidomar, or Guyomar IV (c. 1130–1179) was the Viscount of Léon from 1168 until his death. He was the son and successor of Harvey II. His reign was spent in constant rebellion against his nominal lords in an effort to preserve his historical independence.