白河天皇
Floods often threatened the ancient capital. Emperor Shirakawa recited his three unmanageable things: Sōhei (armed monks of Enryaku-ji), dice, and the water of the Kamo River. These days, however, the riverbanks are reinforced with concrete and have improved drainage systems. The merchant Suminokura Ryōi constructed the Takase River on a parallel with the Kamo River in early 17th century. Transportation was done on the canal instead of the unstable mainstream.