[1] Climate chart - link to Weather atlas: [1] Underwater archaeological surveys have discovered amphoras from the Late Antiquity (4th–6th century) and imported red-polished pottery made in Constantinople, Syria and North Africa, which indicates prospering trade in the area at the time.

According to 17th-century traveller Evliya Çelebi, in 1662 the town Vasilikoz Burgas comprised a square fortress on a ridge overlooking the Black Sea surrounded by plenty of vineyards.

In 1882, a fire destroyed almost the entire town, forcing the locals to re-establish the city on a new site, on the peninsula of the northern cove called Limnos.

Vassiliko was centre of Ahtabolu kaza in Kırkkilise sanjak of Edirne Vilayet between 1878 and 1912[2] After the village was ceded to Bulgaria in 1913, following the Balkan Wars, its Greek population moved to Greece and was replaced by Bulgarians from Eastern Thrace.

After a new wharf was constructed from 1927 to 1937 with the financial aid of Tsar Boris III of Bulgaria, the town was renamed to Tsarevo (a literal Bulgarian translation of Vasiliko, "royal place") in his honour.