Tiberius' 15th Year
Very High Level 1Fact
Tiberius' 15th year = Fall 28 AD to Fall 29 AD
Evidence
Tiberius became emperor August 19, AD 14 after Augustus' death
Standard Roman historiography counts regnal years from accession
Tacitus, Suetonius, Dio Cassius, Josephus all use this reckoning
Coins and inscriptions confirm AD 14 as year 1
Luke, known for meticulous accuracy, would use standard reckoning
No ancient source uses any alternative counting method for Tiberius
Read in Context
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Tiberius 15th Year
"The first major piece of evidence is that Luke tells us John the Baptist started his ministry in the 15th year of Tiberius..."
Depends On
Required By
This is one of the most securely dated facts in ancient history. Every historian, ancient and modern, agrees on Tiberius' regnal years. Some biblical scholars propose alternative countings to make earlier crucifixion dates work, but these lack any historical precedent.