Year 586 (DLXXXVI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 586 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||1339|
|Balinese saka calendar||507–508|
|Chinese calendar||乙巳年 (Wood Snake)|
3282 or 3222
— to —
丙午年 (Fire Horse)
3283 or 3223
|- Vikram Samvat||642–643|
|- Shaka Samvat||507–508|
|- Kali Yuga||3686–3687|
|Iranian calendar||36 BP – 35 BP|
|Islamic calendar||37 BH – 36 BH|
|Minguo calendar||1326 before ROC|
|Seleucid era||897/898 AG|
|Thai solar calendar||1128–1129|
712 or 331 or −441
— to —
713 or 332 or −440
- Spring – Emperor Maurice rejects a peace proposal of the Persians, in exchange for renewed payments in gold.
- Battle of Solachon: A Byzantine army under command of Philippicus defeats the Sassanid Persians, near Dara.
- The Avars besiege Thessalonica (Central Macedonia), the second city of the Byzantine Empire.
- The Vlachs are first mentioned in a Byzantine chronicle (approximate date).
- April 21 – King Liuvigild dies at Toledo after an 18-year reign, and is succeeded by his second son Reccared I.
- April/May: Reccared I becomes King of the West Goths following the death of his father, Liuvigild.
- Slavs advance to the gates of Thessaloniki and the Peloponnese.
- Avars destroy a lien of Roman camps along the Danubian Limes, including Oescus and Ratiaria.
- The Page with the Crucifixion, from the "Rabbula Gospels", at the Monastery of St. John in Beth Zagba (Syria), is completed. It is now kept at the Biblioteca Medicea Laurenziana, Florence, Italy.
- Japanese Buddhism comes under attack as a "foreign" religion.
- Saint Comgall founds an abbey in Bangor, Northern Ireland.
- King Custennin of Dumnonia is converted to Christianity.