During the first part of the Kamakura period, Mino washi was relatively unused and unknown; however, because of activities during the Nanboku-chō period and the Ōnin War, the low-cost Mino washi came into more widespread use.
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The Ōnin War: This conflict began as a controversy over who should follow Ashikaga Yoshimasa as shogun after his retirement – whether it would be his brother (Yoshimi) or his son (Yoshihisa); but this succession dispute was merely a pretext for rival groups of daimyos to fight in a struggle for military supremacy.