You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who was crowned the new roman emperor in a.d. 800?" whose answer is Charlemagne.
Each document should contain about 30 words, and these documents should contain useful information.

Query: who was crowned the new roman emperor in a.d. 800
Useful Output:

Doc 1: Charlemagne the Frank, crowned Emperor of Rome on Christmas Day, A. D. 800; a late ninth century bronze statuette portraying the ideal of the
Doc 2: Charlemagne was crowned “emperor of the Romans” by Pope Leo III in 800 CE, thus restoring the Roman Empire in the West for the first time since
Doc 3: In 800, Pope Leo III crowned Charlemagne the Emperor of the Romans, thereby extending Charlemagne's power and authority. Some historians believe that
Doc 4: In 800, Pope Leo III crowned the Frankish king Charlemagne Emperor of the Romans, reviving the title in Western Europe after more than three centuries. The
Doc 5: How did Charlemagne become emperor of the Holy Roman Empire? Charlemagne was crowned “emperor of the Romans” by Pope Leo III in 800 CE, thus