638: Bliain
| Blianta: 635 636 637 - 638 () - 639 640 641 | |
| Deicheanna blianta: 600í 610í 620í - 630í - 640í 650í 660í | |
| Céadta blianta: 6ú céad - 7ú céad - 8ú céad | |
Eachtraí
Breitheanna
Básanna
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