| Sigebert III | |
|---|---|
 Sigebert III's signet ring | |
| King of Austrasia | |
| Reign | 633–656 |
| Predecessor | Dagobert I |
| Successor | Childebert the Adopted |
| Mayor of the Palace | Grimoald the Elder |
| Born | 630 |
| Died | c. 656 (aged 25–26) Metz[1] |
| Burial | |
| Spouse | Chimnechild |
| Issue | Dagobert II Bilichild Childebert (adoptive) |
| Dynasty | Merovingian |
| Father | Dagobert I |
| Mother | Ragnétrude |
| Religion | Chalcedonian Christianity (Sanctified) |
Sigebert III (c. 630–656) was the Merovingian king of Austrasia from 633 to his death around 656. He was described as the first Merovingian roi fainéant —do-nothing king—, in effect the mayor of the palace ruling the kingdom throughout his reign. However he lived a pious Christian life and was later sanctified, being remembered as Saint Sigebert of Austrasia in the Roman Catholic Church and Eastern Orthodox Church.
- ^ "Sigebert III | Merovingian king | Britannica". www.britannica.com. Retrieved 9 May 2023.