| Eolais mac Biobhsach | |
|---|---|
| Conmaicne Réin | |
| Reign | c. 890–940 AD |
| Successor | Maolmuire mac Eolais |
| Born | c. 870 AD Conmaicne Réin, County Leitrim IE |
| Died | Ireland |
| Issue | Brocan, Anbeith, MaolMuire. |
| House | Conmaicne Réin |
| Father | Biobhsach mac Croman Oge |
| Religion | Christian |
Eolais mac Biobhsach[1] (alias 'Irish: Eolus' "knowledge", anglicized "Wallis",[2] "Olis" or "Olus"[3] fl. AD 900) was a chieftain of 10th century Gaelic Ireland. He is noted as the first "full chieftain of the Conmaicne" of present-day south county Leitrim, and parts of west County Longford. His descendants are known as "the Muintir Eolais".[1]