Therefore , without commenting on the choice of the British army , Galerius accepted the son of his deceased colleague as the ruler of the provinces beyond the Alps ; but he gave him only the title of Caesar , and the fourth rank among the Roman princes , whilst he conferred the vacant place of Augustus on his favorite , Severus II . Therefore , without either condemning or ratifying the choice of the British army , Galerius accepted the son of his deceased colleague as the ruler of the provinces beyond the Alps ; but he gave him only the title of Caesar , and the fourth rank among the Roman princes , whilst he conferred the vacant place of Augustus on his favorite Severus .