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Who were the legendary founders of Goguryeo, Baekje, and Silla?

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Map of the Korean Peninsula highlighted in orange, showing North Korea in the north and South Korea in the south. The peninsula is bordered by China and Russia to the north, the Yellow Sea to the west, the East Sea (Sea of Japan) to the east, and Japan across the sea to the southeast. A small inset globe at the top left shows the peninsula's location in East Asia. — Korea Map of the Korean Peninsula, indicating northern and southern regions.

According to Korean tradition, the three kingdoms were founded by the following legendary leaders:

Goguryeo: Founded by Chumo in 37 BCE.123
Baekje: Founded by Onjo in 18 BCE.423
Silla: Founded by Bak Hyeokgeose in 57 BCE.523

While these figures are credited as the legendary founders, historians note that the actual process of state building and the establishment of centralized monarchies occurred later, primarily under King Taejo for Goguryeo, King Koi for Baekje, and King Naemul for Silla.23