In addition to the "Libro d'oro" of Venice, such books had existed in many of the Italian states and cities before the unification of Italy. For example, the "Libro d'Oro" of Murano, the glass-making island in the Venetian Lagoon, was instituted in 1602, and from 1605 the heads of the Council of Ten granted the title "cittadino di Murano" to those heads of families born on the island or resident there for at least twenty-five years. A "Libro d'Oro" was also compiled on each of the Venetian Ionian Islands as a nobiliary of the members of local Community Councils (Zante 1542, Corfu 1572 and Cephalonia 1593). After the Ionian Islands were conquered and annexed by Napoleon Bonaparte in 1797, the Libro d'Oro was ceremoniously burned.