Year 679 (DCLXXIX) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 679 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
|Ab urbe condita||1432|
|Balinese saka calendar||600–601|
|Chinese calendar||戊寅年 (Earth Tiger)|
3375 or 3315
— to —
己卯年 (Earth Rabbit)
3376 or 3316
|- Vikram Samvat||735–736|
|- Shaka Samvat||600–601|
|- Kali Yuga||3779–3780|
|Minguo calendar||1233 before ROC|
|Seleucid era||990/991 AG|
|Thai solar calendar||1221–1222|
805 or 424 or −348
— to —
806 or 425 or −347
- Emperor Constantine IV signs a peace treaty, of a nominal 30-year duration, with Caliph Muawiyah I of the Umayyad Caliphate. Constantine pays an annual tribute of 3,000 (nomismata) pounds of gold, 50 horses and 50 slaves. The Arab garrisons are withdrawn from their bases on the Byzantine coastlands, including Crete & Cyzicus.
- December 23 – King Dagobert II is murdered in a hunting accident, near Stenay-sur-Meuse (Ardennes), probably on orders from Pepin of Herstal, the mayor of the palace of Austrasia. He is succeeded by Theuderic III, who becomes sole ruler of the Frankish Kingdom.
- King Æthelred of Mercia marries Princess Osthryth, sister of King Ecgfrith of Northumbria (approximate date).
- Nuun Ujol Chaak, an ajaw of the Maya city of Tikal, is by this year deceased, after his final defeat at the hands of B'alaj Chan K'awiil, during the Second Tikal-Calakmul War.
- Adomnán, clerical lawyer, becomes abbot of the monastery of Iona Abbey, located on the island of Iona (modern Scotland).
- October 2 – Leodegar, bishop of Autun, is tortured and executed by Neustrian nobles at Fécamp (Normandy)
- June 23 – Æthelthryth, queen of Northumbria
- October 2, Leodegar, bishop of Autun
- December 23 – Dagobert II, king of Austrasia
- Ælfwine, king of Deira (approximate date)
- Cenn Fáelad mac Ailella, Irish scholar
- Dai Zhide, chancellor of the Tang Dynasty
- Sigebert IV, Frankish prince (approximate date)
- Xu Yushi, chancellor of the Tang Dynasty
- Haldon (1990), p. 64; Kaegi (2008), pp. 381–382; Lilie (1976), pp. 81–82 and Treadgold (1997), p. 327
- E. Vagandard (1902), "Revue des Questions Historiques", pp. 63–67