Thanks go to Gary Holian for help with parts of this timeline, and to "Issak the Pale" for pointing out an error in the timeline that I missed.

Author: Taras Guarhoth (montand@canonfire.com)

Rulers prior to 1 CY were crowned Grand Prince. Starting in 1 CY, the rulers of Aerdy were crowned as Overking.

Notes:

[1] Living Greyhawk Gazetteer - Lord Mikar of Garasteth crowned Grand Prince in -217 CY.
[2] Living Greyhawk Gazetteer - Grand Prince Almor II on the throne in -109 CY during the Battle of a Fortnight's Length.
[3] Living Greyhawk Gazetter - Last Grand Prince and First Overking, crowned in 1 CY. Also, note, there were not two leaders named Nasran. The absence of a Year Zero is sometimes forgotten, so to make calculations easier (and mark the beginning of the Overking Title), Nasran has two entries in the table.
[4] Ivid the Undying - Grandson of Nasran, died in 75 CY, and was succeeded by his wife, Yalranda.
[5] Ivid the Undying - Only Overqueen. Wife of Tenmeris. Lived to be only 40.
[6] Ivid the Undying - Eldest son of Yalranda, took the last name Rax-Nyrond.
[7] Dragon 230 "The Orbs of Dragonkind" - eldest son was killed in 98 CY.
[8] Living Greyhawk Gazetteer - Toran I was on the throne in 134 CY.
[9] It stands to reason that since there was an Erhart I, there needs to be an Erhart II somewhere in here.
[10] Living Greyhawk Gazetteer - Overking Jiranen died in 213 CY.
[11] Living Greyhawk Gazetteer - Zelcor I was on the throne in 223 CY.
[12] Living Greyhawk Gazetteer - Toran II displaced the priesthood of Pholtus from Medegia in 252 CY.
[13] Apparently, the Ravenloft novel King of the Dead, which I don't own, seems to indicate that there was someone named Edron as Overking in the year 283 CY.
[14] Ivid the Undying - Was on the throne at the time of Nyrond’s rebellion.
[15] Ivid the Undying - Son and heir to Portillan. A half-wit.
[16] Ivid the Undying - Son and heir to Galren. A drunkard.
[17] Ivid the Undying - Last Rax Overking, assassinated (presumably) by Ivid I.
[18] Ivid the Undying - First Naelex Overking. Ruled for 48 years.
[19] Ivid the Undying - Ruled for 3 years.
[20] Ivid the Undying - Became the Overking in 556 CY. Fifth Naelex Overking. The empire fell apart in roughly 586 CY with the devestation of Rauxes, and this is presumed to be the end of his rule, although whether he still is around or not is in question.
[21] Living Greyhawk Gazetter - North Aerdy was founded in 586 CY with the crowning of Overking Grenell I. The United Kingdom of Ahlissa was founded in 587 CY with the crowning of Overking Xavener I. Some regard this as the Second Turmoil Between Crowns, and refuse to believe it's the end of Imperial Aerdy.

Note: This article was amended on August 29th at 2:30am EST to correct an error with Toran II's reign and a few typos.