What is "radagaisus"

Radagaisus (died 23 August 406) was a Gothic king who led an invasion of Roman Italy in late 405 and the first half of 406. A committed Pagan, Radagaisus evidently planned to sacrifice the Senators of the Christian Roman Empire to the gods, and to burn Rome to the ground. Radagaisus was executed after being defeated by the half- Vandal general Stilicho. 12,000 of his higher-status fighters were drafted into the Roman army and some of the remaining followers were dispersed, while so many of the others were sold into slavery that the slave market briefly collapsed. These Goths later joined Alaric I in his conquest of Rome in 410.