(Lat. Guerckus, Erechus, or Warochus) was a bishop and count of Nantes. His father sent him for his education to a monastery, and he was appointed to the episcopal see at Nantes, or the first vacancy. However, a few days after having received the news of his election, Gudrech learned of' the death of his brother. The people had made him bishop, but by law of relationship he was made count. He pretended, nevertheless, to occupy the two position is simultaneously. He became famous by his war engagements with Conan le Tors (the crooked), count of Rennes. The death of Gutrech, in 988, was thought to have been caused by poison. See Hoefer, Nouv. Biog. Generale, s.v.