Amdûr

Amdûr is a non-canon, Games-Workshop character made to provide the Easterlings with the most alike leader possible.

What has been known about him for sure since the War of the Ring board game from Games Workshop is that he is the most skilled of an order called the Dragon Knights, who are painted by GW as being trained beyond the ken of ordinary men.

Reputation in Rhûn
Amdûr is iconic in Rhûn for having united almost the entire human population of that portion of the continent under the direct wardship of the Nazgûl and indirect wardship of Sauron, as well as against the nations of Gondor, Rohan, and Dale. It is likely he had invented the Dragon Knights and Dragon Guard as a corps to further his strategy. A man as skilled as himself ought to be rumored to have an extremely brilliant mind for tactics. It seems he was able to raise a powerful navy, a gigantic copper-mining network in the roots of the Red Mountains, a Sea of Rhûn to Iron Hills wall of Brass ingots assembled like bricks to keep Dale out, a Sea of Rhûn to Ash Mountains wall of the same architecture to keep Gondor & Rohan out, and possibly a military of 100,000,000 that he recruited individual legions of 5,000 to 200,000 from.

Personal Life
Nothing is known about Amdûr's origin, diet, or other personal things. Amdûr is not even a canonical LotR character

Battles of Amdûr
The man is said to have constantly supplied Sauron, the Witch-King, and Khamûl with beautifully organized cohorts of Easterlings with which they would snatch victory from the hands of the Gondorians in the face of Orc failure. He gave the Witch-King 7000 Easterlings to invade Minas Tirith and fight off the Rohirrim with. He provided Sauron with defensive Cohorts of Easterlings to maintain unity between the Orcs and Uruk-hai, i.e. the post-Pellenor ambush at Cair Andros. He personally lead 200,000 infantry and a payload of artillery to finally crush the Dalish Empire of Brand, kill Brand, and slay any Erebor resident that dared to protect Dale. He failed to crush the Dwarven stronghold he was requested personally by Sauron to crush, for when he had heard that Sauron died, Amdûr withdrew from Erebor noticing his incramental technology unable to penetrate the Dwarven Craftsmanship of the mountain walls.

The truth about Easterling Lordship
There is no Amdûr in the actual Lore, but it is possible to create Developed characters for adaptations using names in Adûnaic, Westron, or in an Ancient Eastern laguage from our world.