It was founded by the Carthaginians, and became the seat of a bishop in the 4th century.
After being governed by the Moors under the names of Medīna el Jezīra (Arabic: مدينة الجزيرة‎) and Medīna Menūrqa (مدينة منورقة) for several centuries, Ciutadella was recaptured during the reconquista by men serving Alfonso III and became part of the Crown of Aragon.
During the Middle Ages, it became an important trading center.

On 9 July 1558, the Turks under Piyale Pasha and Turgut Reis with a powerful Turkish Armada of 140 ships and 15,000 soldiers, put the town under siege for eight days entered and decimated the town.
The town was defended by only a few hundred men.
All of Ciutadella's 3,099 inhabitants who survived the siege were taken as slaves to Turkey together with other inhabitants of surrounding villages.
In total, 3,452 residents were sold into slavery in the slave markets of Istanbul (Constantinople), Turkey.

An obelisk was set up in the 19th century by  Josep Quadrado in the Plaza d'es Born in memory of the offensive, with the following inscription:
Here we fought until death for our religion and our country in the year 1558
Every year on July 9, a commemoration takes place in Ciutadella, remembering "l’Any de sa Desgràcia", or "the Year of the Disaster".
It was founded by the Carthaginians, and became the seat of a bishop in the 4th century. After being governed by the Moors under the names of Medīna el Jezīra (Arabic: مدينة الجزيرة‎) and Medīna Menūrqa (مدينة منورقة) for several centuries, Ciutadella was recaptured during the reconquista by men serving Alfonso III and became part of the Crown of Aragon. During the Middle Ages, it became an important trading center.
On 9 July 1558, the Turks under Piyale Pasha and Turgut Reis with a powerful Turkish Armada of 140 ships and 15,000 soldiers, put the town under siege for eight days entered and decimated the town. The town was defended by only a few hundred men. All of Ciutadella's 3,099 inhabitants who survived the siege were taken as slaves to Turkey together with other inhabitants of surrounding villages. In total, 3,452 residents were sold into slavery in the slave markets of Istanbul (Constantinople), Turkey.
An obelisk was set up in the 19th century by  Josep Quadrado in the Plaza d'es Born in memory of the offensive, with the following inscription:
Here we fought until death for our religion and our country in the year 1558
Every year on July 9, a commemoration takes place in Ciutadella, remembering "l’Any de sa Desgràcia", or "the Year of the Disaster".
Ciutadella de Menorca