|Millennium:||1st millennium BC|
|89 BC by topic|
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Year 89 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Strabo and Cato (or, less frequently, year 665 Ab urbe condita). The denomination 89 BC 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.
- Consuls: Gnaeus Pompeius Strabo and Lucius Porcius Cato.
- Social War:
- Lex Plautia Papiria extends citizenship to all Italians who applied for it within 60 days. The new citizens are enrolled in eight designated tribes, to prevent domination of the assemblies.
- Lex Pompeia grants Latin rights to cities in Cisalpine Gaul.
- Pompeii is annexed by the Roman Republic.
- Cicero ends his service in the Roman army.
- Aulus Sempronius Asellio, Roman praetor (murdered by creditors)
- Titus Didius, killed in battle during the Social War
- Marcus Aemilius Scaurus, Roman politician (b. c. 163 BC)
- Lucius Porcius Cato, Roman politician and general