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|AD 42 by topic|
|Gregorian calendar||AD 42|
|Ab urbe condita||795|
|Balinese saka calendar||N/A|
|Chinese calendar||辛丑年 (Metal Ox)|
2738 or 2678
— to —
壬寅年 (Water Tiger)
2739 or 2679
|Coptic calendar||−242 – −241|
|- Vikram Samvat||98–99|
|- Shaka Samvat||N/A|
|- Kali Yuga||3142–3143|
|Iranian calendar||580 BP – 579 BP|
|Islamic calendar||598 BH – 597 BH|
|Julian calendar||AD 42|
|Minguo calendar||1870 before ROC|
|Seleucid era||353/354 AG|
|Thai solar calendar||584–585|
168 or −213 or −985
— to —
169 or −212 or −984
AD 42 (XLII) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time it was known as the Year of the Consulship of Caesar and Piso (or, less frequently, year 795 Ab urbe condita). The denomination AD 42 for this year has been used since the Early Middle Ages, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
- Romans take control of Ceuta, a port city on the North African side of the Strait of Gibraltar.
- The territories of the current Algeria and Morocco become a Roman province.
- The Dalmatian legate, Lucius Arruntius Camillus Scribonianus, revolts but his troops defect and his rebellion quickly withers.
- Claudius begins construction of Portus, a harbour bearing a lighthouse on the right bank of the Tiber.
- 25 January – Conversion of the Apostle Paul to Christianity. The exact date is not provided in texts, but the Roman Catholic Church chooses to commemorate this date.
- Traditional date of foundation of the Coptic Orthodox Church of Alexandria by the apostle Mark the Evangelist.
- Herennius Philo, Greek grammarian and writer (d. 141)
- Sixtus I, pope of the Catholic Church (d. 124)
- Arria, Roman noblewoman (committed suicide)
- Aulus Caecina Paetus, Roman politician (committed suicide)
- Gaius Appius Junius Silanus, Roman consul (executed)
- Lucius Annius Vinicianus, Roman politician (committed suicide)
- Lucius Arruntius Camillus Scribonianus, Roman politician (committed suicide)