The Stormcloaks

"Led by the Rouge jarl Ulfric Stormcloak, the Stormcloak Rebellion is waging an aggressive war for independence against the Empire of Tamriel, claiming the Empire to be corrupt and unworthy to govern.and only the Imperial Legion, led by General Tullius on The Orders of King Gronar Iron-Hand, stands ready to oppose Ulfric's plans."

The Stormcloaks were a Group of rebel Fighters serving Ulfric Stormcloak. Stormcloaks included both men and women in the Stormcloak army, but also Citizens including Olfina Gray-Mane who was a part of the Gray-Mane Family in Whiterun that supported the Stormcloaks.

The Stormcloak Rebellion  is a military organization depicted in the Elder Scrolls universe. founded a few years after the Battle of of the red ring, by the rouge jarl ulfric stormcloak, the Stormcloaks, a nordic army under the command of ulfric stormcloak, is at war with the Cyrodiilic Empire of King Gronar Iron-Hand, a Government built on the legacy of the Septim Empire.

The Stormcloaks derived from the small army of nords  that ulfric commanded when he fought the forsworn durning the markarth incident. It adopted the eastmarch bear seal as its insignia, and has many nord fighters from all across skyrim among its ranks, such as  ralof, ulfric himself, and others. Its best Commander is said to be Galmar Stone-fist, ulfric's second in command.

it is unknown if they had any royalty associated with them, other than Ulfric. However, it may be they have no current loyalty to a particular King or Queen of Tamriel, given they appear to follow Ulfric as their ruler and seemingly accepted him as their High King had he Won The Civil War.

Imperial Rule over Skyrim
Following Ulfric's Death at The Hands of The Empire The remaining Stormcloak solders continued to cause trouble for the Empire for a few more years, until the day when The King Himself travelled across skyrim and personally hunted down and destroyed every single stormcloak camp through out the province. Those who didn't perish surrendered unconditionally, and what was left of the Former Rebellion dissolved, thus ending the Civil War finally.

The Second Great War
Durning The Second Great War The Last Remnants of the Stormcloaks would Go On to join The Thalmor in Their Campaign to Destroy The Empire, Hoping to Avenge Their Fallen "High King" by Killing King Gronar Iron-Hand and Destroying The Empire

it is unknown how many Stormcloaks remained after both the Civil War and the Second Great war. Many may have fled due to their masters having been being defeated.