|525 by topic|
|Ab urbe condita||1278|
|Balinese saka calendar||446–447|
|Chinese calendar||甲辰年 (Wood Dragon)
3221 or 3161
— to —
乙巳年 (Wood Snake)
3222 or 3162
|- Vikram Samvat||581–582|
|- Shaka Samvat||446–447|
|- Kali Yuga||3625–3626|
|Iranian calendar||97 BP – 96 BP|
|Islamic calendar||100 BH – 99 BH|
|Minguo calendar||1387 before ROC
|Seleucid era||836/837 AG|
|Thai solar calendar||1067–1068|
651 or 270 or −502
— to —
652 or 271 or −501
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Year 525 (DXXV) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Probus and Philoxenus (or, less frequently, year 1278 Ab urbe condita). The denomination 525 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. In this year, the monk Dionysius Exiguus proposed a calendar starting with the birth of Jesus (the AD system), so this was the first time the year was designated AD. However, the system was not used in general until the reign of Charlemagne in the 9th century.
- King Theodoric the Great sends Pope John I to Constantinople, to negotiate a withdrawal of Byzantine emperor Justin's edict against Arian Christianity.
- Frankish tribesmen, under the command of King Chlothar I, plunder Burgundy.
- Kaleb, king of Aksum, collects a fleet and crosses from Africa to conquer Yemen. He establishes better trade ports on the Red Sea.
- The Daisan river, tributary of the Euphrates, floods Edessa, and within a couple of hours fills the entire city, except for the highest parts. Eventually the pent-up waters break through the city walls. The Shroud of Turin is allegedly discovered during the rebuilding of the city (see Image of Edessa).
Exploration and colonization
- Cosmas Indicopleustes, Alexandrian explorer-geographer, travels up the Nile. He will venture as far to the east as Ceylon, become a monk, and write "Topographia Christiana" to vindicate the biblical account of the world (see 550).
- Dionysius Exiguus, Scythian theologian-mathematician, inaugurates at Rome the practice of using A.D. (Anno Domini) for calendar dates after the birth of Jesus Christ (who was actually born in 7 B.C. or later). Dionysius produces also his tables for computing the date of "Cyclus Paschalis" (Easter Tables).
- The Arian baptistery of Santa Maria is built in Ripa (Rome).
- Buddhist caves are found at Ajanta (India) with stone carvings (approximate date).
- Alexander of Tralles, physician (approximate date)
- John Climacus, monk and writer (approximate date)
- Justin, Byzantine aristocrat and general (d. 566)
- Liuvigild, king of the Visigoths (d. 586)
- Wideok, king of Baekje (Three Kingdoms of Korea)
- Yujiulü, empress of Western Wei (d. 540)
- Boethius, Roman philosopher and writer (or 524)
- Yuan Cha, high official of Northern Wei (approximate date)
- Yūsuf Dhū Nuwas, king of the Himyarite Kingdom (Yemen). *Bandzhis Firenz,king of Danmark and Medieval Gritzania