King Jangsu of Goguryeo vs Ptolemy III Euergetes

King Jangsu moved the Goguryeo capital from Gungnae to Pyongyang, constructing a new fortress city. This relocation strengthened control over the southern territories and facilitated expansion into the Korean peninsula.

King Jangsu led a military campaign that captured the Han River basin from the Baekje kingdom, including the capital Hanseong. This victory gave Goguryeo control over a strategic waterway and rich agricultural lands, significantly expanding its territory.

King Jangsu established diplomatic relations with the Northern Wei dynasty of China, exchanging envoys and tribute. This alliance balanced against the Southern Dynasties and secured Goguryeo's northern borders.

King Jangsu forced the Silla kingdom to become a vassal state of Goguryeo after a series of military campaigns. Silla paid tribute and accepted Goguryeo's suzerainty, establishing Goguryeo as the dominant power in the Korean peninsula.

King Jangsu died after a reign of 79 years, the longest of any Korean monarch. His rule saw Goguryeo reach its maximum territorial extent and peak power, controlling much of Manchuria and the Korean peninsula.

Ptolemy III launched a campaign against the Seleucid Empire following the murder of his sister Berenice. He conquered large parts of Syria, Anatolia, and Mesopotamia, reaching Babylon. The war ended with a peace treaty in 241 BC, securing Ptolemaic control over Seleucid territories.

Ptolemy III dedicated captured Seleucid territories to the Egyptian gods in a grand ceremony. This act reinforced his legitimacy as a pharaoh and demonstrated the wealth and power of the Ptolemaic Kingdom at its territorial peak.

Under Ptolemy III, the Ptolemaic Kingdom reached its greatest territorial extent, controlling Egypt, Cyrenaica, Cyprus, Coele-Syria, and parts of Anatolia and the Aegean. This period marked the height of Ptolemaic power and influence in the Mediterranean.

Ptolemy III expanded the Library of Alexandria, ordering the translation of Greek and foreign texts. He also decreed that all ships docking in Alexandria must surrender their books for copying, greatly increasing the library's collection.