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See also: Names of Thessaloniki in different languages and Thessalonike of Macedon § Legend of Thessalonike

The original name of the city was Θεσσαλονίκη Thessaloníkē. It was named after the princess Thessalonike of Macedon, the half-sister of Alexander the Great, whose name means "Thessalian victory", from Θεσσαλός Thessalos, and Νίκη 'victory' ( Nike ), honoring the Macedonian victory at the Battle of Crocus Field (353/352 BC). A popular Greek legend has it that Thessalonike became a mermaid who lived in the Aegean after the death of Alexander the Great.

Minor variants are also found, including Θετταλονίκη Thettaloníkē, Θεσσαλονίκεια Thessaloníkeia, Θεσσαλονείκη Thessaloneíkē, and Θεσσαλονικέων Thessalonikéon.

The name Σαλονίκη Saloníki is first attested in Greek in the Chronicle of the Morea (14th century), and is common in folk songs, but it must have originated earlier, as al-Idrisi called it Salunik already in the 12th century. It is the basis for the city's name in other languages: Солѹнъ ( Solunŭ ) in Old Church Slavonic, סאלוניקו ( Saloniko ) in Judeo-Spanish (שאלוניקי prior to the 19th century) סלוניקי ( Saloniki ) in Hebrew, Selanik in Albanian, سلانیك ( Selânik ) in Ottoman Turkish and Selanik in modern Turkish, Salonicco in Italian, Solun or Солун in the local and neighboring South Slavic languages, Салоники ( Saloníki ) in Russian, Sãrunã in Aromanian and Săruna in Megleno-Romanian.

In English, the city can be called Thessaloniki, Salonika, Thessalonica, Salonica, Thessalonika, Saloniki, Thessalonike, or Thessalonice. In printed texts, the most common name and spelling until the early 20th century was Thessalonica ( / ˌ θ ɛ s ə l ə ˈ n aɪ k ə, ˌ θ ɛ s ə ˈ l ɒ n ɪ k ə / ), matching the Latin name; through most of rest of the 20th century, it was Salonika ( / s ə ˈ l ɒ n ɪ k ə, ˌ s æ l ə ˈ n iː k ə / ). By about 1985, the most common single name became Thessaloniki. The forms with the Latin ending -a taken together remain more common than those with the phonetic Greek ending -i and much more common than the ancient transliteration -e.

Thessaloniki was revived as the city's official name in 1912, when it joined the Kingdom of Greece during the Balkan Wars. In local speech, the city's name is typically pronounced with a dark and deep L, characteristic of the accent of the modern Macedonian dialect of Greek. The name is often abbreviated as Θεσ/νίκη.

From classical antiquity to the Roman Empire

The city was founded around 315 BC by the King Cassander of Macedon, on or near the site of the ancient town of Therma and 26 other local villages. He named it after his wife Thessalonike, a half-sister of Alexander the Great and princess of Macedonia as daughter of Philip II. Under the kingdom of Macedonia, the city retained its own autonomy and parliament and evolved to become the most important city in Macedonia. Nonetheless, Pella remained the capital of Macedon until its fall.

In 128 BC, twenty years after the fall of the Kingdom of Macedonia, Thessalonica was made the capital of the Roman province of Macedonia. Thessalonica became a free city of the Roman Republic under Mark Antony in 41 BC. It grew to be an important trade hub located on the Via Egnatia, the road connecting Dyrrhachium with Byzantium, which facilitated trade between Thessaloniki and great centres of commerce such as Rome and Byzantium. Thessaloniki also lies at the southern end of the main north–south route through the Balkans along the valleys of the Morava and Axios river valleys, thereby linking the Balkans with the rest of Greece. The city became the capital of one of the four Roman districts of Macedonia.

At the time of the Roman Empire, about 50 AD, Thessaloniki was also one of the early centres of Christianity ; while on his second missionary journey, Paul the Apostle visited this city's chief synagogue on three Sabbaths and sowed the seeds for Thessaloniki's first Christian church. Later, Paul wrote letters to the new church at Thessaloniki, with two letters to the church under his name appearing in the Biblical canon as First and Second Thessalonians. Some scholars hold that the First Epistle to the Thessalonians is the first written book of the New Testament.

In 306 AD, Thessaloniki acquired a patron saint, St. Demetrius, a Christian whom Galerius is said to have put to death. Most scholars agree with Hippolyte Delehaye 's theory that Demetrius was not a Thessaloniki native, but his veneration was transferred to Thessaloniki when it replaced Sirmium as the main military base in the Balkans. A basilical church dedicated to St. Demetrius, Hagios Demetrios, was first built in the fifth century AD and is now a UNESCO World Heritage Site.

When the Roman Empire was divided into the tetrarchy, Thessaloniki became the administrative capital of one of the four portions of the Empire under Galerius Maximianus Caesar, where Galerius commissioned an imperial palace, a new hippodrome, a triumphal arch and a mausoleum, among other structures.

Thessaloniki remained the administrative center of the Diocese of Macedonia. In 379, when the Roman Prefecture of Illyricum was divided between the East and West Roman Empires, Thessaloniki became the capital of the new Prefecture of Illyricum. The following year, the Edict of Thessalonica made Christianity the state religion of the Roman Empire. In 390, troops under the Roman Emperor Theodosius I led a massacre against the inhabitants of Thessalonica, who had risen in revolt against the detention of a favorite charioteer. By the time of the Fall of Rome in 476, Thessaloniki was the second-largest city of the Eastern Roman Empire.

- See also: Thessalonica (theme), Demetrius of Thessaloniki, Kingdom of Thessalonica, Empire of Thessalonica, and Zealots of Thessalonica

From the first years of the Byzantine Empire, Thessaloniki was considered the second city in the Empire after Constantinople, both in terms of wealth and size, with a population of 150,000 in the mid-12th century. The city held this status until its transfer to Venetian control in 1423. In the 14th century, the city's population exceeded 100,000 to 150,000, making it larger than London at the time.

During the sixth and seventh centuries, the area around Thessaloniki was invaded by Avars and Slavs, who unsuccessfully laid siege to the city several times, as narrated in the Miracles of Saint Demetrius. The written sources stipulate that many Slavs settled in the hinterland of Thessaloniki which became known as 'Macedonian Sclavinia'. In the ninth century, the Byzantine missionaries Cyril and Methodius, both natives of the city, created the first literary language of the Slavs, the Old Church Slavonic, most likely based on the Slavic dialect used in the hinterland of their hometown.

A naval attack led by Byzantine converts to Islam (including Leo of Tripoli ) in 904 resulted in the sack of the city.

The economic expansion of the city continued through the 12th century as the rule of the Komnenoi emperors expanded Byzantine control to the north. The city was sacked again in 1185 by Normans from the Kingdom of Sicily.

Thessaloniki passed out of Byzantine hands in 1204, when Constantinople was captured by the forces of the Fourth Crusade and incorporated the city and its surrounding territories in the Kingdom of Thessalonica — which then became the largest vassal of the Latin Empire. In 1224, the Kingdom of Thessalonica was overrun by the Despotate of Epirus, a remnant of the former Byzantine Empire, under Theodore Komnenos Doukas who crowned himself Emperor, and the city became the capital of the short-lived Empire of Thessalonica. Following his defeat at Klokotnitsa however in 1230, the Empire of Thessalonica became a vassal state of the Second Bulgarian Empire until it was recovered again in 1246, this time by the Nicaean Empire.

In 1342, the city saw the rise of the Commune of the Zealots, an anti-aristocratic party formed of sailors and the poor, which is nowadays described as social-revolutionary. The city was practically independent of the rest of the Empire, as it had its own government, a form of republic. The zealot movement was overthrown in 1350, and the city was reunited with the rest of the Empire.