Medieval source    comment

[…] we find that the prisoners made by the Genoese were 9.270, and that there were more than 5.000 dead amongst the citizens of Pisa, according to others 16.000. Nearly all the noble men of Pisa had been taken […]. They say that the Genoese winners […] called a general assembly in order to decide what to do with the prisoners. Some suggested to send them back to Pisa, if the latter was willing to exchange them for the castle of Castro in Sardinia which the Genoese much desired. Others, who were more cruel, declared that they should all be killed as «a dead man does not move war». Others still were of the opinion that they should be kept alive and in prison, so that their women could not remarry and have other children. Thus, the city of Pisa would loose many citizens as so many women, due to the absence of their husbands, would be forced not to have any children. This was the advice that was chosen; they say that the men were kept in prison for eighteen years; when peace was made only 2.000 prisoners survived; the others had died in prison. For this reason Pisa lost its power, and since then it has never been the glorious, splendid, rich, populous and free city that it had once been and that had been reknown in Italy and elsewhere.

from: Pisa, Archivio di Stato, Fondo Roncioni, ms. 342 (ex 22) Cronica istoriale dell'Inclita, et augusta citta di Pisa raccolta nuovamente da diversi autori per il Venerabile Padre Fra Lor.zo Taiuoli da Pisoia dell'Ordine de Predicatori, l. IV fine
Traduzione a cura di Sabina Magrini