Saint Gonzalo (or Gundisalvus) (c. 1040 – c. 1108), a medieval Galician nobleman and clergyman, was the long-serving Bishop of Mondoñedo from 1071. According to one modern source he was a brother of Pedro Fróilaz de Traba. If he was elected at the canonical age of thirty, he would have been born in 1040 or 1041, which would in turn support the contemporary contention that he was old in 1104–5, but cast doubt on his relationship with Pedro Fróilaz. Perhaps he was a more distant relative of the same family, the budding House of Traba.
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