Haido 1 | Prosopography of the Byzantine Empire |
| Sex | M |
| Floruit | E IX |
| Dates | 811 (taq) / 812 (tpq) |
| Religion | Christian |
| Ethnicity | Frank |
| Locations | Constantinople; Basel; Basel (officeplace) |
| Occupation | Bishop |
| Titles | Bishop, Basel (Francia) (office) |
| Textual Sources | Annales Regni Francorum, ed. F. Kurze, MGH, Scr. Rer. Ger. 6 (1895; repr. 1950) (annals) |
Haido 1 was a bishop of Basel; in 811 he was one of the envoys sent by Charlemagne (Karoulos 1) to the emperor Nikephoros I (Nikephoros 8) at Constantinople to ratify the terms of the peace proposed by Nikephoros 8; his fellow-envoys were Hugo 1 and Aio 1: Annales Regni Francorum s.a. 811. In the following year, following the death of Nikephoros 8 and the accession of Michael I (Michael 7), the envoys sent by Karoulos 1 to Nikephoros 8 were sent back by Michael 7 accompanied by imperial envoys (cf. Arsaphios 3) confirming the terms of the earlier agreement: Annales Regni Francorum s.a. 812.
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