Gallicano nel Lazio is a comune (municipality) in the Metropolitan City of Rome in the Italian region of Latium, located about 25 kilometres (16 mi) east of Rome at the feet of the Monti Prenestini.

[3] A castle is mentioned here in 984 AD, called Castrum Gallicani.

Here a Benedictine monastery grew in the following year, later owned by the abbey of San Paolo fuori le Mura.

In 1501 the Borgia conquered it, although it was returned to the Colonna after the death of pope Alexander VI.

In 1622 the Ludovisi family acquired Gallicano, followed by the Rospigliosi Pallavicini in 1633, who held it until 1839.