From the point of view that Shinengo had little intention to oppose the dynasty of the time, they are sometimes regarded as different from 'Itsunengo' and 'Sennengo or Setsunengo (stealing of nengo)' which had a clear rebellious intention.
なお、「私年号」を時の王朝に対する対抗的性格の薄いものとし、明確な対抗的意志をもって建てられる「偽年号」「僭（窃）年号」と区別する場合もある。