Year 597 (DXCVII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 597 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||1350|
|Balinese saka calendar||518–519|
|Chinese calendar||丙辰年 (Fire Dragon)|
3293 or 3233
— to —
丁巳年 (Fire Snake)
3294 or 3234
|- Vikram Samvat||653–654|
|- Shaka Samvat||518–519|
|- Kali Yuga||3697–3698|
|Iranian calendar||25 BP – 24 BP|
|Islamic calendar||26 BH – 25 BH|
|Minguo calendar||1315 before ROC|
|Seleucid era||908/909 AG|
|Thai solar calendar||1139–1140|
723 or 342 or −430
— to —
724 or 343 or −429
- Emperor Maurice writes his last will, in which he describes his ideas for governing the Byzantine Empire (his eldest son, Theodosius, will rule the East from Constantinople, and his second son, Tiberius, the West from Rome).
- Autumn – Balkan Campaign: The Avars, strengthened by the tribute of the Franks, resume their campaign along the Danube River, and besiege the Byzantine fortress city of Tomis (modern Romania) on the Black Sea coast.
- Queen Fredegund defeats her old rival Brunhilda of Austrasia, who supports the claims of her grandsons Theudebert II and Theuderic II to the Frankish throne, against those of Fredegund's son Chlothar II. She dies a few months later at Paris and is buried in the Basilica of Saint Denis.
- Chlothar II, age 13, becomes sole ruler of Neustria, and continues his mother's feud with Brunhilda. He is advised to prepare for war against Austrasia, the eastern part of the Frankish Kingdom.
- Ceolwulf succeeds his brother Ceol as king of Wessex. He becomes regent of Ceol's son Cynegils who is too young to inherit the throne.
- Mangalesha becomes king of the Chalukya Dynasty, after his brother Kirtivarman I dies. He rules as regent of Kirtivarman's son Pulakeshin II, and invades the territory of Khandesh and Gujarat (northwestern India).
- Gregorian Mission: Augustine of Canterbury lands with a group of missionaries on the Isle of Thanet (South East England). He is welcomed by King Æthelberht of Kent, who accepts baptism (along with the rest of his court) at the behest of his Christian Frankish wife, Bertha. Æthelbert assigns Augustine and his 40 monks a residence at Canterbury, where they found a Benedictine monastery that will make the town a centre of Christianity (or 596).
- June 9 – Columba, Irish missionary, dies in Iona (Inner Hebrides) and is buried by his monks in the abbey he has created. He works successfully towards the conversion of northern Britain.
- December 25 – At Christmas, Christianity spreads rapidly in Kent; Augustine and his fellow-labourers baptise more than 10,000 Anglo-Saxons.
- England gets her first written code of laws from Æthelbert. The code is concerned with preserving social order, through compensation and punishment for personal injury (approximate date).
- The King's School is founded by Augustine in Canterbury. He builds an abbey where the Benedictine teaching takes place.
- A Chronicle of England (1864), James Edmund Doyle, p. 26