AD 142

By place

Roman Empire

• Emperor Antoninus Pius orders the construction of the Antonine Wall. The wall stretches 39 miles, from Old Kilpatrick in West Dunbartonshire on the Firth of Clyde, to Carriden near Bo'ness on the Firth of Forth. The Romans build 19 forts and smaller fortlets, to protect the border against the Caledonians.
• Municipal doctors are named throughout the Roman Empire.

  Asia

• First year of the Hanan era of the Chinese Han Dynasty.
• The Chinese Taoist alchemist Wei Boyang, author of the Kinship of the Three, is the first to describe an early form of gunpowder solution.

  By topic

Religion

• Marcion proclaims that the Old Testament is incompatible with Christianity.