|517 by topic|
|Ab urbe condita||1270|
|Balinese saka calendar||438–439|
|Chinese calendar||丙申年 (Fire Monkey)|
3213 or 3153
— to —
丁酉年 (Fire Rooster)
3214 or 3154
|- Vikram Samvat||573–574|
|- Shaka Samvat||438–439|
|- Kali Yuga||3617–3618|
|Iranian calendar||105 BP – 104 BP|
|Islamic calendar||108 BH – 107 BH|
|Minguo calendar||1395 before ROC|
|Seleucid era||828/829 AG|
|Thai solar calendar||1059–1060|
643 or 262 or −510
— to —
644 or 263 or −509
Year 517 (DXVII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Agapitus and Paulus[by whom?](or, less frequently, year 1270 Ab urbe condita). The denomination 517 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.
- King Sigismund of Burgundy is opposed by his son Sigeric, and has him strangled. Overcome with remorse, he retreats to the monastery that he founded, St. Maurice's Abbey (modern Switzerland).
- Emperor Wu Di of the Liang Dynasty becomes a Buddhist, and introduces the new religion to central China. He demands that sacrifices to imperial ancestors be changed to using dried meat, instead of the traditional animals (goats, pigs and cows).
- Council of Epaone: Bishops of southern Gaul convene near Epao (present Anneyron) in Burgundy. The synod enacts the first legislation against wooden altars, forbidding the building of any but stone altars with chrism (a mixture of oil and spice).
- Aryabhata compiles his manual of mathematics and astronomy (approximate date).
- April 5 – Timothy I, patriarch of Constantinople
- Dioscorus II, Coptic Orthodox patriarch of Alexandria
- Macedonius II, patriarch of Constantinople (approximate date)