The Emperor intended to take the Kagogo (a kind of posthumous name) of Emperor Seiwa's different name, 'Mizunoo' (Emperor Seiwa was a father of Emperor Yozei) for himself, and instead presented to his father 'Yozei' as the Kagogo of the Emperor Goyozei (Emperor Yozei was infamous for misconduct and was forced to be abdicated).
後水尾天皇は、不和であった父後陽成天皇に、乱行があるとして退位に追い込まれた陽成天皇の「陽成」の加後号を贈り、自らは陽成の父であった清和天皇の異称「水尾」の加後号を名乗るという意志を持っていたことになる。