1st. Imperial Division

Imperial Army is divided into one hundred divisions that vary in internal structure and their exact troop composition - both are decided according to the local situation and expected enemies and rarely changed. Because of that, divisions expected to fight on open plains will be composed mostly of various types of cavalry, with only enough infantry to lay siege to cities and fortresses, divisions that are placed in lands that are heavily forested will be mostly infantry and so on.
1st. Division of Imperial Army - also known as Imperial Division and Division of Imperial Standard - is stationed around the imperial capital. It is considered a personal guard of Grand Emperors and because of that its composition and number depends on their personality and origin.

Structure

Heavily varied. For most time it is essentially a typical imperial army division, divided into several brigades, regiments and batallions of various types, formed around heavy infantry of great discipline and organization. However, from time to time Grand Emperors are 'outsiders', for example hailing from lands traditionally relying on cavalry, and their personal guard will typically reflect that changes.
Because of its nature it is funded directly from Imperator's personal treasury. It is still considered (at least officially) a part of Imperial Army, however it's mostly autonomous in that matter.

Assets

From 2000 to 25 000 of soldiers, commonly believed to be the best in the whole Imperium. They are certainly paid well and have a lot of prestige, however as entire Imperial Army it is prone to suffering periods of weakness and corruption, in most cases corresponding with general defficiency of imperial organizations.

Type

Military, Army Division