《晋书·帝纪·第五章》
二月辛卯，清河王司马覃被东海王司马越杀害。庚子，互勤侵犯鲎旦，安北将军工涂讨伐打败了他。
三月，东海王越镇鄄城。刘元海侵汲郡，略有顿丘、河内之地。
In February, on xinmao, Sima Tan, Prince of Qinghe, was killed by Sima Yue, Prince of Donghai. On gengzi, Huqin invaded Houdao, and Commander-in-chief of the North Gongtu defeated him.
<s>[INST] Kindly elucidate the central themes in this passage in English: 三月，东海王越镇鄄城。刘元海侵汲郡，略有顿丘、河内之地。 [/INST] In February, on xinmao, Sima Tan, Prince of Qinghe, was killed by Sima Yue, Prince of Donghai. On gengzi, Huqin invaded Houdao, and Commander-in-chief of the North Gongtu defeated him.</s>
Kindly elucidate the central themes in this passage in English: 三月，东海王越镇鄄城。刘元海侵汲郡，略有顿丘、河内之地。
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In February, on xinmao, Sima Tan, Prince of Qinghe, was killed by Sima Yue, Prince of Donghai. On gengzi, Huqin invaded Houdao, and Commander-in-chief of the North Gongtu defeated him.
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