Lewis & Short

Carsŭlae, ārum, f.,

  1. I. a town of Umbria, now Casigliano, Tac. H. 3, 60.
    Hence,
  2. II. Carsŭlāni, ōrum, the inhabitants of Carsulœ, Plin. 3, 14, 19, § 113.
    And neutr.: in Carsulano (sc. praedio), in an estate near Carsulœ, Plin. Ep. 1, 4.