Proli has a Romagna strain in Forlì and Predappio, and a strain at Tivoli (RM) and Tarquinia (VT), could result from a contraction of the medieval name Perolus, hypochoristic of Petrus, but it is also possible that it derives from an error of interpretation of a document, in the epoch Medieval post was established the use of registering his own son as Filius Quondam or Prolis Quondam followed by the name of the father and, as we have cases of cognizations in Quondam, there may be cases of cognitive-cognizations in Prolis subsequently become Offsprings.
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