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|AD 100 by topic|
|Gregorian calendar||AD 100|
|Ab urbe condita||853|
|Balinese saka calendar||21–22|
|Chinese calendar||己亥年 (Earth Pig)|
2796 or 2736
— to —
庚子年 (Metal Rat)
2797 or 2737
|Coptic calendar||−184 – −183|
|- Vikram Samvat||156–157|
|- Shaka Samvat||21–22|
|- Kali Yuga||3200–3201|
|Iranian calendar||522 BP – 521 BP|
|Islamic calendar||538 BH – 537 BH|
|Julian calendar||AD 100|
|Minguo calendar||1812 before ROC|
|Seleucid era||411/412 AG|
|Thai solar calendar||642–643|
226 or −155 or −927
— to —
227 or −154 or −926
AD 100 (C) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar. In the Roman Empire, it was sometimes referred to as year 853 ab urbe condita, i.e., 853 years since the founding of Rome in 753 B.C. The denomination AD 100 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.
- Emperor Trajan and Sextus Julius Frontinus become Roman Consuls.
- Bricks become the primary building material in the Roman Empire.
- Pliny the Younger advances to consulship, giving his panegyric on Trajan in the process.
- The Roman Army reaches 300,000 soldiers.
- Titus Avidius Quietus' rule as governor of Roman Britain ends.
- Timgad (Thamugas), a Roman colonial town in North Africa is founded by Trajan.
- Trajan creates a policy intended to restore the former economic supremacy of Italy.
- The future emperor, Hadrian, marries Vibia Sabina.
- Pakores (last king of the Indo-Parthian Kingdom) takes the throne.
- Paper is used by the general populace in China, starting around this year.
- The Kingdom of Himyarite is conquered by the Hadramaut.
- The Hopewell tradition begins in what is now Ohio c. this date.
- Teotihuacan, at the center of Mexico, reaches a population of 50,000.
- The Moche civilization emerges, and starts building a society in present-day Peru.
Arts and sciences
- In China, the wheelbarrow makes its first appearance.
- Main hall, Markets of Trajan, Rome, is made (until AD 112).
- Appearance of the first Christian dogma and formulas regarding morality.
- The Gospel of John is widely believed to have been written around this date.
- The compilation of the Kama sutra begins in India.
- The Temple of the God of Medicine is built in Anguo, China.
- The Fourth Buddhist Council is convened c. this year.
- Justin Martyr, Christian apologist (approximate date) (d. c. 165)
- Marcus Cornelius Fronto, Roman grammarian, rhetorician and advocate (d. 170)
- Ptolemy, Greek Astrologer, Astronomer, Geographer and Mathametician (d. 170)
- Agrippa II of Judea (b. AD 27)
- Apollonius of Tyana, Greek philosopher (b. c. AD 15) (approximate date)
- Josephus, Jewish historian (b. AD 37)
- John the Apostle of Jesus Christ (b. AD 6)
- Asimov's Guide to the Bible, page 954.