You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Slavs

Context:
Procopius wrote in 545 that "the Sclaveni and the Antae actually had a single name in the remote past; for they were both called Spori in olden times." He describes their social structure and beliefs:

Question:
Who did Procopius write about in 545?

the Sclaveni and the Antae