Ardashir I vs Ivan III the Great

Ardashir I defeated the Parthian king Artabanus IV at the Battle of Hormozdgan. This victory ended Parthian rule and allowed Ardashir to establish the Sassanid Empire, which would dominate Persia for four centuries.

Following his victory at Hormozdgan, Ardashir I systematically conquered the remaining Parthian territories, including Media, Armenia, and Mesopotamia. He established a centralized administration and a Zoroastrian state church.

After his victory, Ardashir I was crowned 'Shahanshah' (King of Kings) at Ctesiphon. He claimed descent from the Achaemenid dynasty, legitimizing his rule and reviving Persian imperial traditions.

Ivan III married Sophia (Zoe) Palaiologina, niece of the last Byzantine emperor. This marriage allowed Ivan to claim succession to the Byzantine Empire, adopt the double-headed eagle as a symbol, and promote Moscow as the Third Rome.

Ivan III conquered the Novgorod Republic after a series of campaigns. He abolished the veche (assembly) and removed the veche bell, incorporating Novgorod's vast territories into the Grand Principality of Moscow.

Ivan III faced the Mongol army of Khan Akhmat across the Ugra River. After weeks of stalemate, the Mongols withdrew without battle. This event ended 240 years of Mongol suzerainty over Russia.

Ivan III promulgated a new legal code, the Sudebnik, which standardized laws across the Russian lands. It restricted peasant mobility by limiting the time for transfer between landowners, a step toward serfdom.

Ivan III launched a war against Lithuania, capturing the cities of Bryansk, Dorogobuzh, and Putivl. The war ended with the Truce of 1503, which ceded significant territories to Moscow.