EDIT: Alright, I'm making this post into a contribution to solidify Eyros' approximate population for the sake of continuity. Let's all please edit out our junk over the last 2 pages debating population figures, okay? Get back to contributing. I'm going to drastically shorten my contributions for a bit now that I've posted big things recently to resolve conflicts.
Contribution:
Eyros is a bustling empire despite its slight decline in recent years, and despite the lack of new conquests in recent centuries. Instead, the Sovereign Dominion has better solidified its grasp on previously-conquered territories through more extensive conscription into the Sovereign Legions, and in more recent decades the implementation and deployment of the Enforcer Masks to pacify unruly 'protectorates'. Within the official borders of the Sovereign Dominion of Eyros, the last Imperial Census 5 years ago determined approximately 12 million people in Eyros, 4-1/2 million of them citizens, and the other 7-1/2 million consisting of peasants, elven villeins, and dwarven serfs. Approximately 2-1/2 million citizens and 4 million commoners are children, however. Many adults achieved citizenship in recent decades from higher conscription in the Legions, which grants citizenry after a 10-year term of loyal service, and the recent lack of conquests has made conscription relatively safe.....
On that matter, the Imperial Census indicated little over 60,000 of Eyros' 5,500,000 adults are currently serving in the Sovereign Legions, somewhat short of the normal 70,000 expected, due to a brief plague in Zhalccu province a few decades ago and several retirements. The Legions have been somewhat stagnant and declining in recent decades, for lack of sufficient funding and lack of any significant military campaigns in this time. The Second through Seventh Legions are each commanded by a Praetor from one of the Six Pillars, such that each Pillar controls a Legion. The First Legion is the Imperial Legion, serving the Grand Monarch and the Senators in defense of Eyrdeyn, but has declined to half its usual strength in recent years. The Imperial Legion is always led by a Praetor selected from amongst the Grand Monarch's immediate brethren, sistren, or cousins, those who were potential heirs of the same generation as the Grand Monarch. The Third Legion, led by House Vajar, and Seventh Legion, led by House Taljik, are at roughly 65% strength currently. The Second and Sixth Legions, led by Houses Zhal and Malarn, are likewise depleted but still close to 80% strength. Each Legion has a title by which its legionnaires call it, besides its numerical designation, such as the First Legion's title of Imperial Legion.
Each Legion is supposed to consist of 10 cohorts, each of which consists itself of 10 centuries, at the best of times anyway, and each century normally enlists 100 soldiers. Typically, any given Eyrian Legion is composed of 4 warstrider-mounted cohorts drawn from the citizenry and aristocracy, plus 2 cohorts of footmen primarily drawn from the ranks of lesser nobles and citizens, and 4 cohorts of auxillaries formed entirely from non-citizens. Dwarves and elves cannot join the Legions, with the exception that House Kiron has recently been allowing its elves to become legionnaires in the Fourth Legion, which a Kiron Praetor commands. Due to their particular territories and wealth, Houses Malarn and Zhal employ larger numbers of warstrider cavalry, so their Sixth and Second Legions, respectively, typically each have 6 mounted cohorts, 2 footmen cohorts, and 2 auxillary cohorts.
The Imperial Census also indicated, though for the Grand Monarch's eyes only, that there were approximately 2,200 elven Masks in service to the orc-blooded, 1,800 of which are the newer Enforcer Masks. The Grand Monarch also knows from the Imperial Census 5 years ago that there are approximately 1,300 gnomish necromancers in the Praes Thanatos, and somewhere upwards of 1,000 other known arcane practicioners in the Sovereignty, but most of these are of relatively minor power according to the Census and the Arcaneum.
Eyrdeyn itself, capitol of the Sovereign Dominion, was estimated at having over 100,000 people in residence, spread out over the city's mountain terraces upon Mt. Xark's southern half, as well as the surrounding foothills and plains.