since the middle ages, because of its visibility, the calatubo castle had an important strategic role: it was part of a line of towers and forts along the coast from palermo to trapani; this defensive line was used to transmit light signals in case of saracens' attack. in particular, the castle of calatubo guaranteed the flow of information that took place between the outposts of carini, partinico and castellammare del golfo.