Decebalus or "The Brave" (originally named Diurpaneus) is a king of Dacia (ruled the Dacians 87–106) and is famous for fighting three wars and negotiating two interregnums of peace without being eliminated against the Roman Empire under two emperors.

In the later short peace (end of 102-105) granted by Trajan, Decebalus continues to act as an independent king, rather than a conquered client and repeatedly annoys or infuriates the Romans.

Consequently, the Legions under Trajan's orders take the offensive again in 105 CE, reducing the Dacian capital Sarmizegetusa in 106.

After that, Decebalus commits suicide.