251年夏,德西烏斯與赫倫尼烏斯在征討哥特人的阿伯里圖斯戰役中陣亡,後將領加卢斯被軍隊擁護為新任皇帝。為了安撫大眾,他隨即將霍斯蒂利安陞為奧古斯都,成為共治皇帝。二人共治了一段時間,直到霍斯蒂利安於251年11月去世為止。他的死因眾說紛紜,4世紀歷史學家維克多和史書《凱撒編年史(英语:Epitome de Caesaribus)》中皆稱他死於瘟疫,不過6世紀歷史學家佐西姆斯則認為他是被加盧斯所殺。
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