Ptolemy's Canon

The Canon of Ptolemy, Ptolemy's Canon or simply the Canon, derives its name from the astronomer Ptolemy of Alexandria. He used the old reginal dating system and fused it with astronomical events to create a list of kings in Babylonia and the Near East with corelating and dates of their reign from Assyrian times through to the successors of Alexander: yet it is critical to note that the purpose of the Canon was not to date kings, but rather to date astronomica phenomena.

Accuracy

While the Canon is considered to be one of the main and essential texts regarding the history of this period, its accuracy is known to not be absolutely perfect.

This was because to Ptolemy the important information was the passage to the years/time in which to record his list of astronomica phenomena. Thus he merged the established form of reginal time that people were familiar with and could relate to and populated that time data with his astronomical records; in short he never had any intention of creating a historically accurate king list. For example (but not limited to), it does not contain:

• Neriglissar's accepted successor Labashi-Marduk who may have only reigned one to three months at most (which is on on the Uruk King List)
• the debated Cyaxares II (which is not on the Uruk King List)
• the accepted Magi False Smerdis (which is not on the Uruk King List).
• the known Marduk-zakir-šumi and Marduk-bêl-iddin as they were not recognized by the Babylonians
• Sennacherib, who had destroyed Babylon.

Therefore regarding Ptolemy's Canon, it is now commonly accepted that the Canon excludes "kings who reigned for less than one year". For example, kings who died somewhere during the year were generally allowed to give their regency to the entirety of the calander year with the next king who may have ascended in July to nominally begin their reign on the first day of the following year: Labashi-Marduk is a great example of this principle as he is lost to the more dominant reigns of both Neriglissar and Nabonidas.

Ptolemy's effective king List

a full table is inbound, but for now such a table may be found at:

https://www.livius.org/articles/concept/ptolemys-canon/

No.	Name	Name (Modern)	Regnal Years	Simplified Dates
01	Nabonassaros	Nabû-Nasir	14	747-734
02	Nadios	Nabû-nadin-zer	02	733-732
03	Chinzer and Poro	Tiglath-Pileser III	05	731-727
04	Iloulaios	Šalmaneser V	05	726-722
05	Mardokempados	Marduk-apla-iddina II	12	721-710
06	Arkeanos	Sargon II	06	709-704
07	Without kings	(Marduk-zakir-šumi and Marduk-bêl-iddin were not recognized by the Babylonians)	02	704-703
08	Bilibos	Bêl-ipni	03	702-700
09	Aparanadios	Aššur-nadin-šumni	06	699-694
10	Rhegebelos	Nergal-ušezib	01	693
11	Mesesimordakos	Mušezib-Marduk	04	692-689
12	Without kings	Sennacherib, who had destroyed Babylon, was not recognized	08	688-681
13	Asaradinos	Esarhaddon	13	680-668
21	Kyros	Cyrus II the Great	09	538-530
21	Kambysos	Cambyses II	08	529-522
22	Dareios the First	Darius I the Great	36	521-486

External Links

Ptolemy's Canon, https://www.livius.org/articles/concept/ptolemys-canon/

Uruk King List, https://www.livius.org/sources/content/uruk-king-list/