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:
Southampton

Context:
Surviving remains of 12th century merchants' houses such as King John's House and Canute's Palace are evidence of the wealth that existed in the town at this time. In 1348, the Black Death reached England via merchant vessels calling at Southampton.

Question:
Ruins of merchants' homes that survive today are evidence that Southampton had rich people in what century?

12th