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:
John,_King_of_England

Context:
In the 16th century political and religious changes altered the attitude of historians towards John. Tudor historians were generally favourably inclined towards the king, focusing on John's opposition to the Papacy and his promotion of the special rights and prerogatives of a king. Revisionist histories written by John Foxe, William Tyndale and Robert Barnes portrayed John as an early Protestant hero, and John Foxe included the king in his Book of Martyrs. John Speed's Historie of Great Britaine in 1632 praised John's "great renown" as a king; he blamed the bias of medieval chroniclers for the king's poor reputation.

Question:
When did political and religious changes alter the attitude of historians towards John?

16th century