From the Wikipedia page 
Pertuis is a commune in the Vaucluse department in the Provence-Alpes-Côte d'Azur region in southeastern France.
Located south of the Luberon, this town is also near Aix-en-Provence, a famous town. Pertuis has existed since at least 981, while a castle was first built in the 12th century. It has registered significant population growth in the last 50 years, with a threefold increase during this period.