Landolfus Sagax or Landolfo Sagace (sagax meaning "expert" or "scholar") was a Lombard historian who wrote a Historia Romana in the last quarter of the tenth century or beginning of the eleventh.
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The manuscript from the Palatine Library at Heidelberg (Pal. lat. 909) preserved in the Vatican Library is written in Beneventan script and shows evidence of having been committed to parchment under the supervision of Landulf himself.