Quartu Sant'Elena is a city in the Province of Cagliari, Sardinia, Italy. It is the third biggest city of Sardinia, the city's name comes from its distance to Cagliari (Quartum miles, Latin for “four miles”), and from the passage there of St. Helena, mother of emperor Constantine. From an artistic point of view, there are five interesting churches situated in the city. The most important are the churches of Sant'Elena Imperatrice (dating before 1589, but now in Neo-Classic lines), Santa Maria Cepola (before 1089) and 'Sant'Agata. There is also Sa dom’e farra (house museum). It is a large peasant house of the 1600s, where you can see various rooms, objects and tools used by the peasant society. The most important religious festivity is dedicated to Saint Elena and is celebrated on the 14th September.