Eucherius was the son of Stilicho, the magister militum of the Western Roman Empire, and Serena, a Roman noblewoman who was the niece of Eastern Roman Emperor Theodosius I. He was born in c. 388 in Rome, Italy. Despite being the son of the magister militum, Eucherius did not rise farther than the modest rank of . Stilicho was accused by his political opponents of plotting to install Eucherius as a third emperor in Illyricum, and as a result of this Stilicho was arrested and executed on 22 August 408, and Eucherius soon after.