When Was The Leaning Tower Of Pisa First Built

The Leaning Tower of Pisa was first built in 1173, when work began on the freestanding bell tower of Pisa’s cathedral. Construction took place in stages and was interrupted several times, so the tower was not completed until 1372—almost 200 years later. Its famous tilt also began while it was still being built, as the tower’s shallow foundations settled unevenly into soft ground.

When Was the Leaning Tower of Pisa First Built?

Construction of the Leaning Tower of Pisa began in 1173. The date most often given for the start is August 9, 1173, although the central fact is that building began in the late 12th century. The tower was planned as the campanile, or bell tower, for the cathedral of Pisa, Italy. Unlike many church towers, it stands apart from the main cathedral building.

The first construction phase continued for only a few years. By around 1178, builders had completed the ground floor and several levels above it. At this point, the tower had begun to lean. Work then stopped for a lengthy period, and the remaining floors were added in later phases. The bell chamber at the top was completed in the 14th century, traditionally dated to 1372.

So, the short answer is that the Leaning Tower of Pisa was first built in 1173, but the structure people see today took nearly two centuries to complete. The long timeline is not just an interesting historical detail: it also helps explain how the tower developed its distinctive shape.

What Was the Tower Built For?

The tower was designed to hold the bells that called worshippers to services at the nearby cathedral. It is part of the Piazza del Duomo, also known as the Piazza dei Miracoli, or “Square of Miracles.” The square includes the cathedral, baptistery, cemetery, and bell tower. Together, these buildings form one of Italy’s best-known medieval architectural groups.

In Italian, a bell tower is called a campanile. Pisa’s campanile was intended to be a grand, visible companion to the cathedral, rather than a defensive structure or a tower built for practical observation. Its circular plan, pale stone, rows of arches, and decorative columns reflect the Romanesque architectural style associated with Pisa during the Middle Ages.

The tower has eight levels, including the bell chamber, and is made primarily of white and grey marble. Its design features arcades and columns that create a light, layered appearance. These details make it striking even without its tilt. The lean, however, eventually transformed a prominent religious building into one of the most recognizable landmarks in the world.

Why Did Construction Take Almost 200 Years?

The Leaning Tower of Pisa was built in separate stages, with long pauses between them. After the first few levels were completed, work halted for about a century. The interruption is commonly linked to political and military conflicts involving Pisa and rival city-states. Medieval building projects could be affected by warfare, shifting civic priorities, and the availability of money and skilled workers.

The pause may have had an unintended benefit. While construction was stopped, the ground beneath the tower had more time to settle. If builders had continued adding weight without interruption, the structure might have become unstable more quickly. The delay did not prevent the lean, but it gave the soil and foundations time to adjust before the upper levels were added.

Work resumed around 1272 under the direction of architect Giovanni di Simone. Builders continued upward, trying to account for the tower’s growing inclination. Rather than producing perfectly horizontal floors in relation to the ground, they adjusted the construction as they went. This helped create the tower’s subtly curved profile, sometimes described as a bend or banana shape.

Another interruption followed during a period of conflict, including Pisa’s defeat by Genoa at the Battle of Meloria in 1284. The bell chamber was eventually completed in the 14th century, around 1372. Counting from the beginning of work in 1173 to that completion date gives an elapsed period of roughly 199 years, although construction itself did not proceed continuously throughout that time.

Why Did the Leaning Tower of Pisa Start to Lean?

The tower began leaning because its foundation was too shallow for the ground beneath it. The soil in this part of Pisa is soft and compressible, made up of layers of clay, sand, and other deposits. As the tower’s weight pressed down, the ground settled unevenly. One side sank more than the other, causing the structure to tilt.

The tower’s foundations extend only a few metres below ground, while the planned building was tall and heavy. That mismatch made the structure vulnerable to uneven settlement. The problem was not that the builders deliberately designed a leaning tower. Rather, the tilt emerged as the soil responded to the increasing weight of the masonry.

When builders noticed the inclination, they tried to compensate as they continued construction. The upper levels do not simply rise straight above the lower ones; their angles and dimensions reflect attempts to counter the growing lean. These adjustments helped the tower remain standing, but they also contributed to its distinctive curved appearance.

The lean continued to change over the centuries. For a long time, it grew gradually, but by the late 20th century the tower had become a serious engineering concern. In 1990, authorities closed it to visitors while specialists worked to reduce the risk of collapse. Engineers later removed small amounts of soil from beneath the higher side and used other stabilization measures. The tower reopened in 2001.

How Tall Is the Leaning Tower of Pisa?

The tower’s height differs depending on which side is measured because it tilts. It is approximately 56 metres tall on its lower side and about 57 metres on its higher side. Those measurements are often given as roughly 183 feet and 186 feet, respectively. The exact figures can vary slightly according to the measurement method and reference point.

The building’s height and visible lean make it seem as though it might topple, but modern stabilization has made it substantially safer than it was before the engineering work. The tower still leans, which is essential to its identity, but its movement has been controlled. Visitors can climb the interior staircase and see the surrounding square from the upper levels, subject to current access arrangements.

Who Designed the Leaning Tower of Pisa?

The identity of the tower’s original architect is not certain. Bonanno Pisano is frequently named in historical accounts, but the attribution is debated. The long construction period also means that several architects and builders contributed to the structure over time. Giovanni di Simone is associated with the later phase that began in the 13th century, and Tommaso Pisano is traditionally connected with completion of the bell chamber.

It is therefore more accurate to describe the tower as the result of a lengthy building project involving multiple stages and contributors than to credit its full design to one person. The shifting ground, repeated pauses, and efforts to compensate for the lean all influenced the final form.

Key Dates in the Tower’s Construction

• 1173: Construction begins on the cathedral’s freestanding bell tower.
• Around 1178: The lower levels have been built, and the tower’s tilt is becoming apparent.
• About a century later: Construction resumes after a long pause.
• 1272: A new phase of building begins under the direction of Giovanni di Simone.
• 1284: Conflict and political upheaval contribute to further delays.
• 1372: The bell chamber is completed, bringing the long construction project to its traditional end date.
• 1990: The tower closes to visitors so engineers can address its stability.
• 2001: After stabilization work, the tower reopens to the public.

Why the Tower’s Construction Date Still Matters

Knowing that the Leaning Tower of Pisa was first built in 1173 puts its appearance into historical context. It was not created as a modern attraction or designed to lean for dramatic effect. It began as a medieval bell tower serving a major religious complex, and its tilt developed because of the challenges of building on unstable ground.

The date also clarifies why different sources may describe the tower as being built in either the 12th, 13th, or 14th century. Each date can refer to a different phase: the project began in the 12th century, construction resumed in the 13th, and the final bell chamber was completed in the 14th. The structure took shape over generations, not in a single continuous campaign.

Conclusion: The Leaning Tower of Pisa Began in 1173

The Leaning Tower of Pisa was first built in 1173 as the bell tower for Pisa’s cathedral complex. Construction paused and resumed over many decades, and the tower was not completed until around 1372. Its tilt began early, when its shallow foundations settled unevenly into the soft soil beneath the site. Today, the tower remains a remarkable example of medieval architecture, engineering challenges, and the way an unintended feature can become a world-famous landmark.

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