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|Centuries:||1st century – 2nd century – 3rd century|
|Decades:||100s 110s 120s – 130s – 140s 150s 160s|
|Years:||136 137 138 – 139 – 140 141 142|
|139 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||892|
|Chinese calendar||戊寅年 (Earth Tiger)
2835 or 2775
— to —
己卯年 (Earth Rabbit)
2836 or 2776
|Coptic calendar||−145 – −144|
|- Vikram Samvat||195–196|
|- Shaka Samvat||60–61|
|- Kali Yuga||3239–3240|
|Iranian calendar||483 BP – 482 BP|
|Islamic calendar||498 BH – 497 BH|
|Minguo calendar||1773 before ROC
|Seleucid era||450/451 AG|
|Thai solar calendar||681–682|
Year 139 (CXXXIX) 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 Hadrianus and Praesens (or, less frequently, year 892 Ab urbe condita). The denomination 139 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.
- The Tomb of Hadrian in Rome is completed; emperor Antoninus Pius cremates the body of Hadrian and places his ashes together with that of his wife Vibia Sabina and his adopted son, Lucius Aelius, in the mausoleum.
- Marcus Aurelius is named Caesar. He marries Faustina the Younger, daughter of Antoninus Pius.
- Antoninus Augustus Pius and Gaius Bruttius Praesens become Roman Consuls.