TIL #Shakespeare probably lifted the Montague and Capulet rivalry from Luigi da Porta, writing several decades earlier. Da Porta probably drew on recent popular stories and actual rivalries from his time in Udine. Da Porto's uncle was related to the powerful Montecchi family originally from Verona, whose 13th century Ghibelline rivalry with the Guelph Capelletti family of Cremona was famous enough that #Dante mentioned it in his Divine Comedy.