The accounts记述 · the ancient witnesses
Greek historians · 希腊史家
Cassius Dio — Roman History （卡西乌斯·狄奥·罗马史）primary source · 源典
§ 77
reader-loci 77.11–77.15 — 'Severus, seeing that his sons were changing their mode of life and that the legions were becoming enervated by idleness, made a campaign against Britain, though he knew that he should not return', with the ethnography of the Caledonians and Maeatae at 77.12 and the order to spare no one at 77.15阅读器编号77.11至77.15——“塞维鲁见诸子习性日移，军团因逸而弛，遂征不列颠，虽自知不返”；77.12记喀里多尼亚人与迈阿泰人之风土，77.15记不留一人之令
Provenance: “primary source” = curated canonical witness (editorial); “dated witness” = derived from the ToposText date index by year-span, with the matched loci count. Sparse counts may include incidental mentions.出处：「源典」为校订之正典见证（编辑判断）；「系年见证」由 ToposText 系年索引按年代跨度推得，附匹配条目数；稀少者或含偶涉。
On the timeline时间轴上
→ See this and all 18 historians on the chronology spine于编年脊柱上一览本事件与全部 18 位史家