Trajan's Dacian Wars were two military campaigns fought between the Roman Empire and the Dacians under King Decebalus during the reign of Emperor Trajan. The conflicts stemmed from repeated Dacian incursions into the province of Moesia and from Rome's growing need for resources. Discontent with the treaty Domitian had concluded with Decebalus in 89 AD persisted, and Trajan, keen to assert himself as a soldier-emperor, took the opportunity to reassert Roman authority.