The Republic of Venice never had an actual formal constitution, much less a written constitution. Neither did it have any kind of foundational event.
“Pien Collegio” from the Lessico Veneto (1851) by Fabio Mutinelli, translated by René Seindal.
“Doge” from the Lessico Veneto (1851) by Fabio Mutinelli, translated by René Seindal.
The Venetian state was always an ad hoc construct, and institutions came and went at the convenience of the ruling elite.
“Consiglio dei Dieci” from the L’Archivio di Stato di Venezia: indice generale, storico, descrittivo ed analitico (1937) by Andrea da Mosto
“Minor Consiglio” from the L’Archivio di Stato di Venezia: indice generale, storico, descrittivo ed analitico (1937) by Andrea da Mosto
“Maggior Consiglio” from the L’Archivio di Stato di Venezia: indice generale, storico, descrittivo ed analitico (1937) by Andrea da Mosto
The Republic of Venice changed continuously as conditions inside and outside of it changed, until it gradually found its final form in the 1300s and 1400s.
“Pregadi” from the Lessico Veneto (1851) by Fabio Mutinelli, translated by René Seindal.