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:
The city walls include God's House Tower, built in 1417, the first purpose-built artillery fortification in England. Over the years it has been used as home to the city's gunner, the Town Gaol and even as storage for the Southampton Harbour Board. Until September 2011, it housed the Museum of Archaeology. The walls were completed in the 15th century, but later development of several new fortifications along Southampton Water and the Solent by Henry VIII meant that Southampton was no longer dependent upon its fortifications.

Question:
In what century did Southampton complete construction of the wall around the city?

15th