The Ancient Romans built a so-called "Castrum" over the present site,
which together with the "Castrum" of the tower above the village of
Santa Maria, was aimed at protecting the population.
However, all the
island's defense s eventually collapsed under the invasion of the pirates Saracenes in the year 813, and the fortress was completely
destroyed.
After having been abandoned to pirates' incursions for more than
100 years, in 929 the island is finally occupied by the Duke of
Gaeta, who partially re-builds the ancient Tower and constitutes a small
village. In 1191 the Emperor Enrico occupies the island and takes
possession of the Tower, but because of the pressure from the Bishop of
Gaeta who claims title to it, he finally abandons the island.
In 1435, King Alfonso 1 of Aragon, occupies the island with
massive military forces and he elects the Tower of Ponza as the place
from were the assault of Gaeta should be directed. The Genoa army, lead
by Commandant Biagio Assareto, rushes to support the besieged and, on
August, 1, 1439, the Genoa army occupies the island and the
Tower. In 1454, King Alfonso 1 takes possession of the Tower, and
while trying to fortify it, the Pope sends an ambassador in order to
notify the King that he should immediately release the occupied
territories, since these are deemed to fall under the Church's
authority. King Alfonso 1, as the only reply, expels the Pope's
ambassador, and escorts him up to the Roman coast. While trying to find
a diplomatic solution for the issue of the Tower of Ponza's ownership,
the island undergoes new pirate incursions, which imply severe damage to
the village and the Tower itself.
After having settled all the disputes with King Alfonso1,
in 1477, Pope Paolo II designates the Ponziane islands as a
County and in 1478, he grants them in perpetual use, together
with the Tower of Ponza, to the Duke Ariano Alberico Carafa, and
appoints Perrucci Conte di Policastro and Ariamone Conte di Borrelli as
his advisors. Next year, the Tower is again fortified and the village is
rebuilt.
In 1485, the Gaeta's army besieges the Tower of Ponza, and after
a short combat, it takes it. However, Carafa obtains from King Carlo III
the right to repossess the Tower; in 1524 the Viceroy of Naples,
based on the Pope's orders, attributes the ownership of the Tower to the
Pontifical State.
In 1532, the famous pirate Barbarossa,
proceeding from Turkey, after having occupied the Tower, lies waste the
island of Ponza.
In 1542 the Tower and the island are granted to the Duke of
Castro Pier Luigi Farnese, but because of the lack of a proper garrison,
the island is frequently assaulted in 1543 by the Algerian
corsairs, who eventually invade it and massacre the soldiers of the
Tower, as well as the rest of the entire population.
On June, 1, 1543 the so-called
"Commendatario" of Gaeta is officially installed in the Tower of Ponza,
under the supervision of the Viceroy of Naples and the Pope, "in order
to prevent the pirates' calamity", and considering that during the 1543 incursion, the pirates had almost reached Rome. The Tower of
Ponza is again fortified in order to prevent the invasion of the island;
the island of Ponza however remains inhabited, because of the
population's fear of new assaults by the pirates. From then on,
everything on the island is strictly controlled from the Tower.
After the extinction of the Farnese family, all their assets,
including the island of Ponza, are inherited by the family of the
Borbone of Naples. In 1734, Carlo III of Borbone declares that
the island of Ponza shall be colonized, and that a proper defense system
shall be constructed. The Tower of Ponza is enlarged, reinforced and
elevated; an enormous tank for rain water is also built. The island is
provided with long-range cannons, as well as a "signal tree made of
glasses and flags". In practice, all the defense system seems to be
strategically new: the main Tower, more than being a classical turtle's
shield outside the body, is located at the center of the eight defensive
points. Once again, the "panottico" theory was actually used by the
Borbonic military genius. The Tower represents the central point for
communication from peripheral stations, as well as the starting point
for defense orders. From the Tower, all the main defense points of the
island could be seen. This represented a rather complicated system,
which however also turned out very practical and effective, and which
helped preventing any further attempts of aggression by the pirates.
In 1848, Carlo Pisacane, after having kidnapped some officers
of the Port, enters the Tower; he is however rather disappointed in
discovering the absence of weapons and of any classical defense system:
the only things that he finds are communication and optical equipment.
The Tower was, once again, hiding its actual defense function, and
orders could be easily sent out to the coast, notwithstanding the
presence of the occupants.
Once the famous story of Pisacane was over, the Borbonic Government,
in order to avoid any similar tragedy to the little community of the
island, decided to install a telegraph in the Tower of Ponza, whose
cable of more than 30 miles was linked to the fortress of Gaeta: an
absolute record for that time!
After the Italian Unity, the Tower was completely abandoned, as well
as all the other coastal military buildings. At the beginning of the
20th Century, it became the seat of the municipality, and it was
therefore enlarged in order to create extra rooms. After WW1, the
municipality was transferred again and the Tower became a school, but
only for a few years and after which it was again abandoned, and
because, of a total lack of maintenance, it was almost destroyed.
The Tower was purchased by present owners in 1950, to
be intended for cultural and tourist use.
It is now the Torre dei Borboni Hotel in Ponza
However, all the
island's defense s eventually collapsed under the invasion of the pirates Saracenes in the year 813, and the fortress was completely
destroyed. 
After the extinction of the Farnese family, all their assets,
including the island of Ponza, are inherited by the family of the
Borbone of Naples. In 1734, Carlo III of Borbone declares that
the island of Ponza shall be colonized, and that a proper defense system
shall be constructed. The Tower of Ponza is enlarged, reinforced and
elevated; an enormous tank for rain water is also built. The island is
provided with long-range cannons, as well as a "signal tree made of
glasses and flags". In practice, all the defense system seems to be
strategically new: the main Tower, more than being a classical turtle's
shield outside the body, is located at the center of the eight defensive
points. Once again, the "panottico" theory was actually used by the
Borbonic military genius. The Tower represents the central point for
communication from peripheral stations, as well as the starting point
for defense orders. From the Tower, all the main defense points of the
island could be seen. This represented a rather complicated system,
which however also turned out very practical and effective, and which
helped preventing any further attempts of aggression by the pirates.
In 1848, Carlo Pisacane, after having kidnapped some officers
of the Port, enters the Tower; he is however rather disappointed in
discovering the absence of weapons and of any classical defense system:
the only things that he finds are communication and optical equipment.
The Tower was, once again, hiding its actual defense function, and
orders could be easily sent out to the coast, notwithstanding the
presence of the occupants. 
