Houjou Ujiyasu was a famous SAMURAI in the Sengoku era.
He was a daimyou who ruled the land of Sagami(current Kanagawa prefecture).
He is known as a master of strategy.
He won many battles with his neighborhood daimyous, and was feared.
The "Kawagoe Yasen"(The night battle of Kawagoe) is the most famous in those episodes.
He defeated 80,000 enemies with only 10,000 soldiers in this battle.
He entered into an alliance with Takeda Shingen, and expanded his territory at Kantou region.
On the other hand, Uesugi Kenshin protected daimyous of Kanto region, so they opposed intensely.
However, Ujiyasu entered into an alliance with Kenshin in conflict with Shingen afterwards.
Ujiyasu dedicated his life to rule the Kanto region, but it didn't come true.
Ujiyasu had a talent of the domestic administration, he governed well his territory.
When he died, it's said that citizens of his territory sobbed and grieved.