Construction:
The construction of the Tower of Pisa
was performed in three stages over a period of about 174 years.
Construction of the first floor of the white marble campanile began on
August 9, 1173, a period of military success and prosperity. This first
floor is surrounded by pillars with classical capitals, leaning against
blind arches. Today, it is still unscarred from centuries of weather and
age. There is controversy about the identity of the architect of the
Leaning Tower of Pisa. For many years, the design was attributed to
Guglielmo and Bonanno Pisano, a well-known 12th-Century resident artist of
Pisa, famous for his bronze casting, particularly in the Pisa Duomo.
Bonanno Pisano left Pisa in 1185 for Monreale, Sicily, only to come back
and die in his home town. His sarcophagus was discovered at the foot of
the tower in 1820. The tower first acquired a lean after the third floor
was built in 1178, due to a mere three-meter foundation set in weak,
unstable subsoil. This means the design was flawed from the beginning.
Construction was subsequently halted for almost a century, because the
Pisans were almost continually engaged in battles with Genoa, Lucca and Florence.
This allowed time for the underlying soil to settle. Otherwise, the tower
would almost certainly have toppled. In 1198, clocks were temporarily
installed on the unfinished construction. In 1272, construction resumed
under Giovanni di Simone, architect of the Camposanto. Another four floors
were built at an angle to compensate for the tilt. Construction was halted
again in 1284, when the Pisans were defeated by the Genoans in the Battle
of Meloria. The bell-chamber was not finally added until 1372. It was
built by Tommaso di Andrea Pisano, who succeeded in harmonizing the Gothic
elements of the bell-chamber with the Romanesque style of the tower. There
are seven bells, one for each note of the musical major scale. The largest
one was installed in 1655.