《明史·本纪·卷六》
五月一日，改胪朐河为饮马河。
五月丁卯，更名胪朐河曰饮马。
On the 1st of May, changed the name of Luqu River to Yinma River.
<s>[INST] Kindly elucidate the central themes in this passage in English: 五月丁卯，更名胪朐河曰饮马。 [/INST] On the 1st of May, changed the name of Luqu River to Yinma River.</s>
Kindly elucidate the central themes in this passage in English: 五月丁卯，更名胪朐河曰饮马。
user
On the 1st of May, changed the name of Luqu River to Yinma River.
assistant