Early life 
Konishi Yukinaga was the son of a wealthy Sakai merchant, Konishi Ryūsa. His wife was also baptised under the name of Maria.
Invasion of Korea 
Yukinaga led the initial forces under Toyotomi Hideyoshi to invade Korea in the Seven-Year War. He was noted for his role in the capture of Busan and Seoul and the defensive at Pyongyang. Afterwards, his vassal, Naitō Joan acted as the envoy to negotiate peace with Ming China.
In order to achieve a truce, he negotiated a false surrender to China, although to Toyotomi Hideyoshi it was a truce between two equal states. Later, a Ming envoy came to Japan to award Toyotomi the position of the King of Japan. This enraged Hideyoshi and exposed the truth behind Yukinaga's earlier diplomatic mission and resultant deception. Despite the charge of disloyalty, Yukinaga again led forces alongside Katō Kiyomasa to invade Korea a second time. He defended Suncheon Castle, and repelled Ming (China) and Joseon allied forces.
After Hideyoshi's death, Yukinaga joined Ishida Mitsunari's side during the Battle of Sekigahara, but was ultimately defeated. He fled to Mount Ibuki, but was captured by Takenaka Shigekado's forces. Being a Christian, Yukinaga refused to commit suicide and was executed.
- Sansom, George Bailey, A History of Japan, 1334-1615, page 383; Stanford University Press, © 1961.