It is recorded as a city in the 6th-century Synecdemus and mentioned by the contemporary historian Procopius of Caesarea, who recorded that a movable bridge linked the two shores of the strait.
In Byzantine times, Chalcis was usually called Euripos, a name also applied to the entire island of Euboea, although the ancient name survived in administrative and ecclesiastical usage until the 9th century; alternatively, it is possible that the name was given anew to a settlement that was founded in the 9th century in the location of the ancient city, after the latter had been abandoned in the early Middle Ages.
The town survived an Arab naval raid in the 880s and its bishop is attested in the 869–70 Church council held at Constantinople.

By the 12th century, the town featured a Venetian trading station, being attacked by the Venetian fleet in 1171 and eventually seized by Venice in 1209, in the aftermath of the Fourth Crusade.

For Westerners, its common name was Negropont or Negroponte.
This name comes indirectly from the Greek name of the Euripus Strait: the phrase στὸν Εὔριπον 'to Evripos', was rebracketed as στὸ Νεὔριπον 'to Nevripos', and became Negroponte in Italian by folk etymology, the ponte 'bridge' being interpreted as the bridge of Chalcis to Boeotia.

The town was a condominium between Venice and the Veronese barons of the rest of Euboea, known as the "triarchs", who resided there.
Chalcis or Negroponte became a Latin Church diocese, see below.

A large hoard of late medieval jewellery dating from Venetian times was found in Chalcis Castle in the nineteenth century and is now in the British Museum.
The synagogue dated to around 1400.

Negroponte played a significant role in the history of Frankish Greece, and was attacked by the Principality of Achaea in the War of the Euboeote Succession (1257/8), the Catalan Company in 1317, the Turks in 1350/1, until it was finally captured by the Ottoman Empire after a long siege in 1470.
That siege is the subject of the Rossini opera Maometto II.
The Ottomans made it the seat of the Admiral of the Archipelago (the Aegean Islands).
In 1688, it was successfully held by the Ottomans against a strong Venetian attack.
It is recorded as a city in the 6th-century Synecdemus and mentioned by the contemporary historian Procopius of Caesarea, who recorded that a movable bridge linked the two shores of the strait. In Byzantine times, Chalcis was usually called Euripos, a name also applied to the entire island of Euboea, although the ancient name survived in administrative and ecclesiastical usage until the 9th century; alternatively, it is possible that the name was given anew to a settlement that was founded in the 9th century in the location of the ancient city, after the latter had been abandoned in the early Middle Ages. The town survived an Arab naval raid in the 880s and its bishop is attested in the 869–70 Church council held at Constantinople.
By the 12th century, the town featured a Venetian trading station, being attacked by the Venetian fleet in 1171 and eventually seized by Venice in 1209, in the aftermath of the Fourth Crusade.
For Westerners, its common name was Negropont or Negroponte. This name comes indirectly from the Greek name of the Euripus Strait: the phrase στὸν Εὔριπον 'to Evripos', was rebracketed as στὸ Νεὔριπον 'to Nevripos', and became Negroponte in Italian by folk etymology, the ponte 'bridge' being interpreted as the bridge of Chalcis to Boeotia.
The town was a condominium between Venice and the Veronese barons of the rest of Euboea, known as the "triarchs", who resided there. Chalcis or Negroponte became a Latin Church diocese, see below. 
A large hoard of late medieval jewellery dating from Venetian times was found in Chalcis Castle in the nineteenth century and is now in the British Museum. The synagogue dated to around 1400.
Negroponte played a significant role in the history of Frankish Greece, and was attacked by the Principality of Achaea in the War of the Euboeote Succession (1257/8), the Catalan Company in 1317, the Turks in 1350/1, until it was finally captured by the Ottoman Empire after a long siege in 1470. That siege is the subject of the Rossini opera Maometto II. The Ottomans made it the seat of the Admiral of the Archipelago (the Aegean Islands). In 1688, it was successfully held by the Ottomans against a strong Venetian attack.
Chalcis