Jehan Lagadeuc

Jehan Lagadeuc , or Lagadec, Breton priest of the diocese of Tréguier at the 15th century is the author of the Breton Catholicon , namely a Dictionnaire Breton, franczoys and Latin , at the same time the first Breton Dictionnaire, the first French dictionary, and the first dictionaure trinlingue. It was written in 1464.

Jehan Lagadeuc had been born with the manor from Mezédern located at the south from the borough from Plougonven (Ploégonven).