Biryu of Baekje was the 11th king of Baekje

Baekje

Baekje or Paekche was a kingdom located in southwest Korea. It was one of the Three Kingdoms of Korea, together with Goguryeo and Silla....

, one of the Three Kingdoms of Korea

Three Kingdoms of Korea

The Three Kingdoms of Korea refer to the ancient Korean kingdoms of Goguryeo, Baekje and Silla, which dominated the Korean peninsula and parts of Manchuria for much of the 1st millennium...

. According to the Samguk Sagi

Samguk Sagi

Samguk Sagi is a historical record of the Three Kingdoms of Korea: Goguryeo, Baekje and Silla. The Samguk Sagi is written in Classical Chinese and its compilation was ordered by Goryeo's King Injong Samguk Sagi (History of the Three Kingdoms) is a historical record of the Three Kingdoms of...

, he was second son of the 6th king Gusu

Gusu of Baekje

Gusu of Baekje was the 6th king of Baekje, one of the Three Kingdoms of Korea. According to the Samguk Sagi, he was descended from the founding king Onjo and the eldest son of the 5th king Chogo....

 and the younger brother of the 7th king Saban

Saban of Baekje

Saban of Baekje was the 7th king of Baekje, one of the Three Kingdoms of Korea. He was the eldest son of the 6th king Gusu.According to the Samguk Sagi, Saban was found too young to rule and quickly succeeded by King Goi, the younger brother of the 5th king Chogo...

. However, since this would make him rule until at least the age of 110, modern historians commonly assume that Biryu was in fact the son or grandson of Saban's younger brother.

After the preceding king Bunseo

Bunseo of Baekje

Bunseo of Baekje was the tenth king of Baekje, one of the Three Kingdoms of Korea. He was the eldest son of the ninth king Chaekgye. He continued to wage war against the Chinese Lelang commandery whose forces had killed his father....

 was assassinated by Chinese agents, Biryu ascended to the throne because Bunseo's sons were deemed too young to rule. This appears to have been part of a power struggle between the two branches of the Baekje royal family, the descendants of the 5th king Chogo

Chogo of Baekje

Chogo of Baekje was the fifth king of Baekje, one of the Three Kingdoms of Korea.-Background:He was the son of King Gaeru....

 (Biryu's ancestor) and that of the 8th king Goi

Goi of Baekje

Goi of Baekje was the 8th king of Baekje, one of the Three Kingdoms of Korea. He was the second son of the 4th king Gaeru and younger brother of the 5th king Chogo.-Background:...

.

In 312, he appointed Hae Gu to head the military. In 327, he stopped a rebellion by his stepbrother U Bok. In 337, he received a mission from the neighboring Silla

Silla

Silla was one of the Three Kingdoms of Korea, and one of the longest sustained dynasties in...

.

Japanese historians suspect Biryu, like Saban, as the progenitor of certain aristocratic clans of Yamato period

Yamato period

The is the period of Japanese history when the Japanese Imperial court ruled from modern-day Nara Prefecture, then known as Yamato Province.While conventionally assigned to the period 250–710 , the actual start of Yamato rule is disputed...

Japan. Any genealogical records either did not exist or have been lost/destroyed for over a millennium.