The summit of the hill that overlooks Capronno is referred to in old documents as castello or castellaccio (castle). No remains are visible now in this wooded area, but 1970 during agricultural work, the remains of walls, pottery and brick/tiles of Roman and Lombard epoch were unearthed.
The dominant position and shape of the land suggest that in antiquity there may have stood here a walled area or stronghold; such a structure may have formed part of a network of forts found also at Brebbia, Ispra, Angera, Monvalle, Vergiate, Sesto Calende and Castelletto Ticino.