it was sold to the Republic of Genoa; and on 28 August 1421 it was bought by the Republic of Florence. The name 'Leghorn' derives from Genoese name Ligorna. Livorno was used certainly in the eighteenth century by Florentines. Between 1427 and 1429, a census counted 118 families in Livorno, including 423 persons. Monks, Jews, military personnel, and the homeless were not included in the census. The only remainder of medieval Livorno is a fragment of two towers and a wall, located inside the Fortezza Vecchia. Medicean period (1500–1650) After the arrival of the Medici, the ruling dynasty of Florence, some modifications were made; between 1518 and 1534 the Fortezza Vecchia was constructed, and the voluntary resettlement of the population to Livorno was stimulated, but Livorno still remained a rather insignificant coastal fortress. By 1551, the population had grown to 1562 residents. During the Italian Renaissance, when it was ruled by the Grand Duchy of Tuscany of the House of Medici Livorno was designed as an "Ideal town". In 1577 the architect Bernardo Buontalenti drew up the first plan. The new fortified town had a pentagonal design, for which it is called Pentagono del Buontalenti, incorporating the original settlement. The Porto Mediceo was overlooked and defended by towers and fortresses leading to the town centre. In the late 1580s, Ferdinando I de' Medici, Grand Duke of Tuscany, declared Livorno a free port (porto franco), which meant that the goods traded here were duty-free within the area of the town's control. In 1593, the Duke's administration established the Leggi Livornine to regulate trade. These laws protected merchant activities from crime and racketeering, and instituted laws regarding international trade. The laws established a well-regulated market and were in force until 1603. Expanding Christian tolerance, the laws offered the right of public freedom of religion and amnesty to people having to gain penance given by clergy in order to conduct civil business. The Grand Duke attracted numerous Turks, Persians, Moors, Greeks, and Armenians, along with Jewish immigrants. The arrival of the latter began in the late sixteenth century with the Alhambra Decree, which resulted in the expulsion of Jews from Spain and Portugal – while Livorno extended to them rights and privileges; they contributed to the mercantile wealth and scholarship in the city. Livorno became an enlightened European city and one of the most important ports of the entire Mediterranean Basin. Many European