Great Council of Venice
Doge Gradenigo was responsible for the so-called "Serrata del Maggior Consiglio", the Locking of the Great Council of Venice. This new law, passed in February 1297, restricted membership of the future Councils only to the descendants of those nobles who were its members between 1293 and 1297. This move created an oligarchic system, disenfranchising a great majority of the citizens and provoking some unrest.