Helge (Oleg the Prophet) was a legendary Varangian (Viking) prince, shrewd warrior, and statesman who founded Kievan Rus', uniting Slavic tribes, conquering Kiev, and securing trade with Byzantium, known for his foresight (hence "Prophet") and a famous, prophesied death by a snake from his horse's skull, embodying a powerful ruler bridging Norse and Slavic worlds.

Key Characteristics & Actions:
Founder of Kievan Rus': Succeeded Rurik, moved capital to Kiev (882), uniting north/south Rus lands.
Military Prowess: Led successful campaigns, notably against Constantinople (907), securing trade deals by showing his shield on the city gates.
Shrewd Leader: Foresaw treachery, avoiding poisoned food from Byzantines, earning his title "the Wise".
Norse-Slavic Bridge: A Viking (Varangian) who consolidated power over East Slavs, forming a foundational state.
Legendary Death: Prophesied to die from his horse, he seemingly escaped it, only to be bitten by a snake emerging from the horse's skull years later, fulfilling the prophecy.

Description:
Appearance (Implied): A powerful, commanding Viking leader, often depicted with a beard, in armor.
Personality (Legendary): Cunning, far-sighted, ruthless when necessary, yet charismatic.
Role: More than just a warrior; a state-builder and diplomat, crucial in early East Slavic history.

Historical vs. Legendary: While many details, like the horse-skull death, are considered legendary embellishments from the 12th-century Primary Chronicle, Oleg's foundational role in Kievan Rus' is a cornerstone of East Slavic history.