[1] It is reckoned one of the earliest pieces of Italian literature, composed in or shortly after 1213.
It records a battle between Lucca and Pisa near Massa fought in mid-January that year.
The Ritmo is preserved in manuscript of Burgundio of Pisa's Latin translation of Nemesius' De natura hominis, now codex 45 in the library of the Collegio di Spagna at the University of Bologna.
It was discovered by Francesco Filippini and first published by Amedeo Crivellucci (Studi storici, XXII, 2).
It was studied by Giovanni Dinelli in "Una battaglia tra Pisani e Lucchesi presso Massa in una cantilena storica in volgare del principio del sec.