The Household Lares are the gods of the home. Most houses in ancient rome would have a shrine to these gods, and make offerings in the hope that the Lares would protect them and their home.
The Temple is thought to be unique in ancient Rome, with the small household shrine being adapted into a city-wide temple and sanctuary in the hope that it would protect the city after the devastating Earthquake of 62 AD, thus making it one of the newest buildings in the city. Unfortunately its protection couldn't stand up to the terrible natural disaster that defeated the city.
The Tempio dei Lari (in English, Temple of the Lares) is close to the Temple of Vespasian. It was built for expiation after the earthquake in 62 A.D.. The archaeologists are doubtful on the real dedication of the temple due the wealth of the decorations, with policromis marbles, make to slant the hypothesis of a place of imperial cult