《旧唐书·本纪·卷五》
夏四月十二日，皇上回东都。
夏四月己巳，还东都。
On the twelfth day of the fourth month of summer, the Emperor returned to Dongdu.
<s>[INST] Translate the following Classical Chinese text into English: 夏四月己巳，还东都。 [/INST] On the twelfth day of the fourth month of summer, the Emperor returned to Dongdu.</s>
Translate the following Classical Chinese text into English: 夏四月己巳，还东都。
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On the twelfth day of the fourth month of summer, the Emperor returned to Dongdu.
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