《北史·列传·卷四十四》
 魏代的皇帝在平文帝以前，都是部落酋长。
二曰 魏氏平文以前，部落之君长耳。
The emperors of the Northern Wei dynasty before Emperor Pingwen were all tribal chieftains.
<s>[INST] Kindly elucidate the central themes in this passage in English: 二曰 魏氏平文以前，部落之君长耳。 [/INST] The emperors of the Northern Wei dynasty before Emperor Pingwen were all tribal chieftains.</s>
Kindly elucidate the central themes in this passage in English: 二曰 魏氏平文以前，部落之君长耳。
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The emperors of the Northern Wei dynasty before Emperor Pingwen were all tribal chieftains.
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