Ōan
- 应安（应安是日本北朝的年号之一。这个时代的北朝天皇是后光严天皇与后圆融天皇。室町幕府的将军是足利义满）
Ōan
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abstract:
, also romanized as Ō-an, was a Japanese era name (年号, nengō, lit. year name) of the Northern Court during the Era of Northern and Southern Courts after Jōji and before Eiwa.
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