Year 712 (DCCXII) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 712 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||1465|
|Balinese saka calendar||633–634|
|Chinese calendar||辛亥年 (Metal Pig)|
3408 or 3348
— to —
壬子年 (Water Rat)
3409 or 3349
|- Vikram Samvat||768–769|
|- Shaka Samvat||633–634|
|- Kali Yuga||3812–3813|
|Japanese calendar||Wadō 5|
|Minguo calendar||1200 before ROC|
|Seleucid era||1023/1024 AG|
|Thai solar calendar||1254–1255|
838 or 457 or −315
— to —
839 or 458 or −314
- The Bulgars under Tervel, ruler (khagan) of the Bulgarian Empire, raid Thrace and reach the city walls of Constantinople. Skirmishes continue until 716; Emperor Philippicus transfers a Byzantine army from the Opsikion Theme in Asia Minor, to police the Balkan Peninsula.
- February – King Ansprand dies, and is succeeded by his son Liutprand as ruler of the Lombards. During his reign, Liutprand becomes the greatest of the Lombard Kings. Coins and documents from his court at Pavia confirm the impression of a strong and effective monarch.
- Umayyad conquest of Hispania: From North Africa, Musa ibn Nusayr lands in Iberia (Al-Andalus), with an army of 18,000 Arabs and Berbers. He joins the Islamic conquest and captures the city of Seville (Andalusia), where he meets stiff resistance after 3-months of siege.
- Arab forces under Qutayba ibn Muslim conquer Khwarezm and Samarkand (modern Uzbekistan).
- September 8 – Emperor Rui Zong abdicates after a brief reign, in favor of his 27-year-old son Xuan Zong, who ascends the imperial throne of the Tang Dynasty (China).
- Xuan Zong reestablishes control over the Oxus and Jaxartes valleys. During his reign he defeats the invading Arab armies, in a series of campaigns in Fergana.
- King Dae Jo-yeong of Balhae (Korea) resumes tributary payments to the Tang Dynasty. The Tai peoples are forced to accept Chinese sovereignty (approximate date).
- Ali ibn Husayn, fourth Shia Imam
- Anas ibn Malik, well known sahaba. (b. 611 or 612)
- Ansprand, king of the Lombards
- Aripert II, king of the Lombards (or 711)
- Bran ua Máele Dúin, king of the Uí Ceinnselaig (Ireland)
- Cú Cherca mac Fáeláin, king of Osraige (Ireland)
- Fazang, Chinese Buddhist patriarch (b. 643)
- Idwal Iwrch, king of Gwynedd (Wales)
- Khri ma lod, empress of the Tibetan Empire
- Vindicianus, bishop of Cambrai (approximate date)