Centuries: 1st century BC - 1st century - 2nd century
- Han dynasty was restored in China as Liu Xiu proclaimed himself emperor, start of jiangwu era (->56).
- Luoyang becomes the capital of the Eastern Han Dynasty.
- Pomponius Mela formalizes the climatic zone system.
- Tiberius settles a dispute between Messenia and Sparta over the Ager Dentheliales on Mount Taygetus, awarding the land to Messenia.
- Aelius Sejanus unsuccessfully attempts to marry the widow of Drusus Julius Caesar.
For the number 25, see twenty-five.