《辽史·本纪·卷四》
二月初一，建国号为大辽，大赦天下，改元大同。
二月丁巳朔，建国号大辽，大赦，改元大同。
On the first day of the second lunar month, the country name was erected as “Daliao” and a universal pardon was issued; the era was changed to “Datong”.
<s>[INST] Identify the key themes in this Classical Chinese text and explain them in English: 二月丁巳朔，建国号大辽，大赦，改元大同。 [/INST] On the first day of the second lunar month, the country name was erected as “Daliao” and a universal pardon was issued; the era was changed to “Datong”.</s>
Identify the key themes in this Classical Chinese text and explain them in English: 二月丁巳朔，建国号大辽，大赦，改元大同。
user
On the first day of the second lunar month, the country name was erected as “Daliao” and a universal pardon was issued; the era was changed to “Datong”.
assistant