AD 138

Millennium:	1st millennium
Centuries:	1st century 2nd century 3rd century
Decades:	110s 120s 130s 140s 150s
Years:	135 136 137 138 139 140 141

138 in various calendars

Gregorian calendar	138 CXXXVIII
Ab urbe condita	891
Assyrian calendar	4888
Balinese saka calendar	59–60
Bengali calendar	−455
Berber calendar	1088
Buddhist calendar	682
Burmese calendar	−500
Byzantine calendar	5646–5647
Chinese calendar	丁丑年 (Fire Ox) 2835 or 2628     — to — 戊寅年 (Earth Tiger) 2836 or 2629
Coptic calendar	−146 – −145
Discordian calendar	1304
Ethiopian calendar	130–131
Hebrew calendar	3898–3899
Hindu calendars
- Vikram Samvat	194–195
- Shaka Samvat	59–60
- Kali Yuga	3238–3239
Holocene calendar	10138
Iranian calendar	484 BP – 483 BP
Islamic calendar	499 BH – 498 BH
Javanese calendar	13–14
Julian calendar	138 CXXXVIII
Korean calendar	2471
Minguo calendar	1774 before ROC 民前1774年
Nanakshahi calendar	−1330
Seleucid era	449/450 AG
Thai solar calendar	680–681
Tibetan calendar	阴火牛年 (female Fire-Ox) 264 or −117 or −889     — to — 阳土虎年 (male Earth-Tiger) 265 or −116 or −888

Year 138 (CXXXVIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Niger and Camerinus (or, less frequently, year 891 Ab urbe condita). The denomination 138 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.

Events

By place

Roman Empire

• February 25—Emperor Hadrian makes Antoninus Pius his successor, on condition that he adopts Marcus Aurelius and Lucius Verus.
• July 10—Hadrian dies after a heart failure at Baiae, he is buried at Rome in the Gardens of Domitia beside his wife, Vibia Sabina.
• Antoninus Pius succeeds Hadrian as Roman Emperor and asks the Senate to confer divine honors for Hadrian.
• Construction begins on the Theater of Philadelphia (Amman).
• Hadrian's Villa, Tivoli, Italy, is finished.

By topic

Commerce

• The silver content of the Roman denarius falls to 75 percent under emperor Antoninus Pius, down from 87 percent under the reign of Hadrian.

Births

• Han Zhidi, emperor of the Han Dynasty (d. 146)

Deaths

• July 10—Hadrian, Roman emperor (at Baiae)
• Zenobius, Greek sophist who taught rhetoric at Rome