Emperor Shirakawa

Shirakawa abdicated the throne but continued to rule from a monastery as a cloistered emperor, creating the Insei system. This allowed retired emperors to wield real political power, bypassing the Fujiwara regents and dominating court politics for decades.

Shirakawa forced his son Horikawa to succeed him, overriding Fujiwara preferences. This conflict solidified the cloistered emperor's control over succession and reduced Fujiwara influence, leading to decades of political tension.

Shirakawa appointed Taira no Masamori as military governor of Ise Province, elevating the Taira clan's status. This move strengthened the imperial court's military capacity and laid the foundation for the Taira's later rise to power.

Shirakawa sponsored the construction and renovation of numerous Buddhist temples, including the Hossho-ji and Ensho-ji. This patronage strengthened the imperial family's religious authority and influenced Heian-period Buddhist art and architecture.