In the mirror universe, Oswald was a Terran male who ruled as the Emperor of the Terran Empire during the 20th century.

During his reign, Emperor Oswald interacted with a time displaced Spock, who persuaded him that the Empire had to moderate its savagery in order to survive for another thousand years. Oswald's reformist writings would eventually result in the existence of an underground dissident organization known as the Oswaldites by the 23rd century. (Decipher module: Through a Glass, Darkly)

Monarchs of the Terran Empire
by century TerranEmpire
Various dates Sherman
20th century Adolf HitlerPol PotOswaldJimmy CarterHenry Starling
21st century George the Second
22nd century Sato I
23rd century Sato IIStephane LouvinPhilippa GeorgiouAlexanderMichael BurnhamAiriamSato IIISpockGarth of IzarJohn GillHarry MuddKodosAlex DanaherJohn CrayAndrovar DrakeTiberius the First
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