List of cities founded by Alexander the Great in the context of "Eratosthenes"

The Greco-Bactrian Kingdom (Greek: Βασιλεία τῆς Βακτριανῆς, romanized: Basileía tês Baktrianês, lit. 'Kingdom of Bactria') was a Greek kingdom during the Hellenistic period located in Central Asia and Afghanistan. The kingdom was founded by the Seleucid satrap Diodotus I Soter in about 256 BC, and continued to dominate Central Asia until its fall around 120 BC. At its peak the kingdom consisted of present-day Afghanistan, Tajikistan, Uzbekistan and Turkmenistan, and for a short time, small parts of Kazakhstan, Pakistan, India and Iran. An extension further east, with military campaigns and settlements, may have reached the borders of the Qin State in China by about 230 BC.

A Greek population was already present in Bactria by the 5th century BC. Alexander the Great had conquered the region by 327 BC, founding many cities, most of them named Alexandria, and further settling Macedonians and other Greeks. After the death of Alexander, control of Bactria passed on to his general Seleucus I Nicator. The fertility and the prosperity of the region led to the creation of the Greco-Bactrian kingdom under Diodotus by the early 3rd century BC, as a successor state of the Seleucid Empire. The Bactrian Greeks grew increasingly more powerful and invaded north-western India between 190 and 180 BC under king Demetrius, the son of Euthydemus. This invasion led to the creation of the Indo-Greek kingdom, which in turn was a successor to the Greco-Bactrian kingdom, and was subsequently ruled by the kings Pantaleon and Apollodotus I. Historical records indicate that many rich and prosperous cities were present in the kingdom, but only a few of them have been excavated, such as Ai-Khanoum and Bactra. The city of Ai-Khanoum, in north-eastern Afghanistan, had all the hallmarks of a true Hellenistic city with a Greek theater, gymnasium and some houses with colonnaded courtyards.

This is a chronological summary of the expedition of Alexander the Great into Asia against the Persian Empire of king Darius III, with indication of the countries/places visited or simply crossed, including the most important battles/sieges and the cities founded (Alexandrias). The events of the expedition are shown in chronological order. For each event is given, separated by:

1. date of event,
2. places/cities crossed, indicated by ancient name (present name, country),
3. regions, provinces or Persian satrapies of the places/cities crossed, with indication of their capital cities (where appropriate).

Ai-Khanoum (/aɪ ˈhɑːnjuːm/, meaning 'Lady Moon'; Uzbek: Oyxonim) is the archaeological site of a Hellenistic city in Takhar Province, Afghanistan. The city, whose original name is unknown, was likely founded by an early ruler of the Seleucid Empire and served as a military and economic centre for the rulers of the Greco-Bactrian Kingdom until its destruction c. 145 BC. Rediscovered in 1961, the ruins of the city were excavated by a French team of archaeologists until the outbreak of conflict in Afghanistan in the late 1970s.

The city was probably founded between 300 and 285 BC by an official acting on the orders of Seleucus I Nicator or his son Antiochus I Soter, the first two rulers of the Seleucid dynasty. There is a possibility that the site was known to the earlier Achaemenid Empire, who established a small fort nearby. Ai-Khanoum was originally thought to have been a foundation of Alexander the Great, perhaps as Alexandria Oxiana, but this theory is now considered unlikely. Located at the confluence of the Amu Darya (a.k.a. Oxus) and Kokcha rivers, surrounded by well-irrigated farmland, the city itself was divided between a lower town and a 60-metre-high (200 ft) acropolis. Although not situated on a major trade route, Ai-Khanoum controlled access to both mining in the Hindu Kush and strategically important choke points. Extensive fortifications, which were continually maintained and improved, surrounded the city.

Bucephalus (/bjuː.ˈsɛ.fə.ləs/; Ancient Greek: Βουκεφᾰ́λᾱς, romanized: Boukephalas; c. 355 BC – June 326 BC) or Bucephalas, was the horse of Alexander the Great, and one of the most famous horses of classical antiquity. According to the Alexander Romance (1.15), the name "Bucephalus" literally means "ox-headed" (from βοῦς and κεφᾰλή), and supposedly comes from a brand (or scar) on the thigh of the horse that looked like an ox's head.

Ancient historical accounts state that Bucephalus's breed was that of the "best Thessalian strain", and that he died in what is now Punjab, Pakistan, after the Battle of the Hydaspes in 326 BC. Alexander was so grieved at the loss of his horse that he named one of the many cities he founded after him, as Alexandria Bucephalus.

Boukephala (Ancient Greek: Βουκεφάλα) and Nikaia (Νίκαια) were two cities founded by Alexander the Great on either side of the Hydaspes (modern-day Jhelum River, Pakistan) during his invasion of the Indian subcontinent. The cities, two of many founded by Alexander, were built shortly after his victory over the Indian king Porus at the Battle of the Hydaspes in early 326 BC.

It is not certain which settlement had which name. Built on the site of the battlefield, the city on the eastern bank was most likely called Nikaia (from nike, lit. 'victory'), while its western companion was probably named after Alexander's horse Bucephalus, who died during or after the battle. Their construction was supervised by Craterus, one of Alexander's leading generals. Both cities initially suffered from the rains of the South Asian monsoon. Boukephala seems to have had a more distinguished legacy than Nikaia: mentioned by Pliny the Elder and Ptolemy, it appears in the 1st-century AD Periplus Maris Erythraei manuscript and on the later Tabula Peutingeriana map. The cities' precise locations are unknown, but it is considered likely that Boukephala was located in the vicinity of modern Jalalpur and that Nikaia was across the river near present-day Mong.