Needless to say, the temple where he, as the Lord of the Country, shaved his head and became a monk must have deeper significance.
During the Warring States Period in Japan, it was common for daimyo and military generals to shave their heads and become monks.
Firstly, they knew themselves were heavily laden with sins of killing, seeking peace by converting to Buddhism.
Secondly, it was also a political tactic.
Buddhism had profound influence in Japan, to the extent of being able to incite religious wars. Converting to Buddhism could demonstrate one's piety and attract followers.
And during power transitions, becoming a monk could help stabilize the situation for the successor without arousing suspicion. Additionally, after becoming a monk, former enemies would generally cease their relentless pursuit.
After all, upon becoming a monk, one is seen to have severed worldly ties, equating in religious view to being a dead person.
