The first embroidered item appeared during the Shang Dynasty. article +adjective + noun

Hi, Sanya! The first sentence is correct, and the reason the definite article is used in front of "Shang Dynasty" is because "Shang Dynasty" is a particular noun. For a list of conditions on when to use the definite article, you can read through this link: https://www.ef.edu/english-resources/english-grammar/definite-article/ The second sentence would only be correct if the noun wasn't referring to a particular time period. For example, if it said: "The first embroidered item appeared in ancient times," it would be correct to not include the definite article because "ancient times" is a general time period. I hope this helps. 如果不懂的话，请告诉我。我也可以用中文帮你解释。