1 The city was founded in 312 BC by Seleukos I Nikator at the confluence of the Tigris River and a major canal from the Euphrates. Seleukeia on the Tigris was one of the great Hellenistic cities and a very important trading centre.

Appian, Syriake 58, tolds the following legend about how the city was established: ... They say, also, that when the Magians were ordered to indicate the propitious day and hour for beginning the foundations of Seleucia-on-the-Tigris they falsified as to the hour because they did not want to have such a stronghold built against themselves. While the king (Seleukos I Nikator) was waiting in his tent for the appointed hour, and the army, in readiness to begin the work, stood quietly till Seleucus should give the signal, suddenly, at the true hour of destiny, they seemed to hear a voice ordering them on. So they sprang to their work with such alacrity that the heralds who tried to stop them were not able to do so. When the work was brought to an end Seleucus, being troubled in his mind, again made inquiry of the Magians concerning his city, and they, having first secured a promise of impunity, replied, “That which is fated, o king, whether it be for better or worse, neither man nor city can change, for there is a fate for cities as well as for men. It pleases the gods that this city shall endure for ages, because it was begun on the hour on which it was begun. We feared lest it should be a stronghold against ourselves, and falsified the appointed time. Destiny is stronger than crafty Magians or an unsuspecting king. For that reason the deity announced the more propitious hour to the army. It is permitted you to know these things so surely that you need not suspect us of deception still, for you were presiding over the army yourself, as king, and you had yourself ordered them to wait; but the army, ever obedient to you in facing danger and toil, could not now be restrained, even when you gave them the order to stop, but sprang to their work, not a part of them merely, but all together, and their officers with them, thinking that the order had been given. In fact it had been given. That was the reason why not even you could hold them back. What can be stronger in human affairs than a king, unless it be a god, who overcame your intention and supplanted us in giving you directions about the city; for the god is in hostility to us and to all the people round about? What can our resources avail hereafter with a more powerful race settled along side of us? This city of yours has had a fortunate beginning, it will be great and enduring. We beg that you will confirm your pardon of our fault which we committed from fear of the loss of our own prosperity.” The king was pleased with what the Magians said and pardoned them. This is what I have heard about Seleucia.

2 The horn of plenty signifying prosperity and unlimited abundance. Its origin is connected with the events surrounding the birth of Zeus. According to ancient authors, Zeus was cared for by nymphs who fed him milk and honey. A nymph named Amaltheia owned a bull’s horn that could magically produce food or drink in limitless supply. According to another version of the myth, her goat named Aix (whose milk she fed the infant Zeus) accidentally broke off one of its horns and this became the cornucopiae. According to yet another version, Amaltheia was the goat from whom Zeus suckled milk and one of Amaltheia’s horns flowed with nectar and the other with ambrosia. After Zeus had matured, he honored Amaltheia by placing her in the sky as a constellation. In gratitude to the nymphs who had nurtured him, he presented them with a horn from Amaltheia that had the power to provide food and drink in limitless supply. (Bitner, The Cornucopia - A Horn of Plenty)

The cornucopiae is usually depicted overflowing with fruits and other agricultural produces. The depicted horns belonged to an ancient breed of wild goats known for their large horns. The word cornucopiae (plural cornuacopiae) is a combination of two Latin words, cornu (horn) and copiae (plenty). (Bitner, The Cornucopia - A Horn of Plenty)

3 A tall headdress symbolizing prosperity and typically worn by deities with eastern origins. It represents a basket used to hold wool or fruit.

4 The beginning of the Seleukid Era was set as follows: In 311 BC, shortly after capturing Babylon, Seleukos I Nikator began the enumeration of his satrapal years there. However, after his decisive victory over Antigonos Monophthalmos in 307/6 BC, he backdated his “fictitious” first regnal year to coincide with Nisanu 1, 311 BC (New Year’s Day in the Babylonian calendar). This marked the antedated epoch of the Seleukid calendar according to the Babylonian reckoning. Later in 305/4 BC, when Seleukos I took the diadem and assumed the royal title “King”, he retained the numbering of his regnal years in Babylon but employed the Makedonian calendar and thus pushed his accession year back to Dios, 312 BC (Dios was the first month of the Makedonian calendar; it corresponds to October-November). This became the antedated epoch of the Seleukid era on the Macedonian calendar. (Assar, Recent Studies in Parthian History, Part I, p. 6)

Conversion of Seleukid years based on the Macedonian calendar: if x is a Seleukid year (and x<311) then the corresponding BC time interval is from 313–x to 312–x (approximately from October 313–x to September 312–x BC).

Conversion of Seleukid years based on the Babylonian calendar: if x is a Seleukid year (and x<310) then the corresponding BC time interval is from 312–x to 311–x (approximately from April 312–x to March 311–x BC).