The First Roman–Dacian War took place from 101 to 102 AD. The Kingdom of Dacia, under King Decebalus, had become a threat to the Roman Empire, and defeated several of Rome's armies during Domitian's reign (81–96). The Emperor Trajan was set on ridding this threat to Rome's power and in 101 set out determined to defeat Dacia. After a year of heavy fighting, King Decebalus came to terms and accepted an unfavourable peace. When he broke these terms in 105, the Second Dacian War began.