310s BC establishments

Thessaloniki (; ; also known by various spellings and names) is a city in northern Greece. The nation's second-largest, with slightly over one million inhabitants in its metropolitan area, it is the capital of the geographic region of Macedonia, the administrative region of Central Macedonia and the Decentralized Administration of Macedonia and Thrace. It is also known in Greek as , literally "the co-capital", a reference to its historical status as the "co-reigning" city () of the Byzantine Empire alongside Constantinople.

Chengdu is the capital city of the Chinese province of Sichuan. With a population of 20,937,757 at the 2020 census, it is the fourth most populous city in China, and it is the only city with a population of over 20 million apart from provincial-level municipalities. It is traditionally the hub of Western China.

Hellenistic-era Greek state in Western Asia (312–63 BC)

Guilin (Standard Zhuang: Gveilinz), formerly romanized as Kweilin, is a prefecture-level city in the northeast of China's Guangxi Zhuang Autonomous Region. It is situated on the west bank of the Li River and borders Hunan to the north. Its name means "forest of sweet osmanthus", owing to the large number of fragrant sweet osmanthus trees located in the region. The city has long been renowned for its scenery of karst topography.

Roman highway from Rome, Italy, to Brundisium 312 BC

calendar era

ruling dynasty in Hellenistic Syria

first ancient Roman aqueduct

thumb|Cassandreia Cassandreia or Cassandrea (, Kassándreia) was once one of the most important cities in Ancient Macedonia, founded by and named after Cassander in 316 BC. It was located on the site of the earlier Ancient Greek city of Potidaea, at the isthmus of the Pallene peninsula. The fact that Cassander named it after himself suggests that he may have intended it to be his capital, and if the canal which cuts the peninsula at this point was dug or at least planned in his time, he may have intended to develop his naval forces using it as a base with a harbour on each of the east and west

political union in the Aegean islands, Hellenistic period

Italian archaeological site