Bygone coins refer to coins that are no longer in circulation. The term can be used to describe coins from a variety of countries and eras. Three examples of bygone coins are liras, lire, and sous. Liras were the currency of Turkey until 2005, when it was replaced by the Turkish lira. Lire were the currency of Italy until 2002, when it was replaced by the euro. Sous were the currency of France until 1795, when it was replaced by the franc.