Given the task definition and input, reply with output. This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.

The period between the foundation of the Han dynasty and Wang Mang's reign is known as the Western Han dynasty (simplified Chinese: ; traditional Chinese: ; pinyin: Xi Han) or Former Han dynasty (simplified Chinese: ; traditional Chinese: ; pinyin: Qianhan) (206 BC 9 AD). During this period the capital was at Chang'an (modern Xi'an). From the reign of Guangwu the capital was moved eastward to Luoyang. The era from his reign until the fall of Han is known as the Eastern Han dynasty (simplified Chinese: ; traditional Chinese: ; pinyin: Dong Han) or the Later Han dynasty (simplified Chinese: ; traditional Chinese: ; pinyin: Hou Han) (25220 AD).
Where did the capital move to after the reign of Guangwu?