| Associated with (no title) |
| Disassociated from Content-Type: |
| Associated with 改元期日 |
| Associated with 建元 |
| Associated with 称元法 |
| Associated with 祥瑞改元 |
| Associated with 改元 |
| Associated with 革年改元 |
| Associated with 称元 |
| Associated with 何々改元 |
| Associated with ○○改元 |
| Associated with 災異改元 |
| Associated with 革命勘文 |
| Associated with 代始改元 |
| Disassociated from (no title) |
| Disassociated from 改元期日 |
| Disassociated from 革年改元 |
| Disassociated from 革命勘文 |
| Associated with 新元号 |
| Associated with 旧年号 |
| Associated with 旧元号 |
| Associated with 新旧元号 |
| Associated with 新年号 |
| Associated with 元号の復活 |
| Associated with 元号の再開 |
| Disassociated from 新年号 |
| Disassociated from 新元号 |
| Associated with 改年 |
| Associated with 建年 |
| Associated with 東洋式改元 |
| Disassociated from 称元 |
| Disassociated from 代始改元 |