What time period was Sir Lancelot living in?

Sir Lancelot is a legendary figure from Arthurian legend, and he is typically associated with the medieval period, specifically the 5th to 6th centuries in Britain. However, the stories about him were popularized in the 12th century through works like those of Chrétien de Troyes. As a result, while his character is set in an earlier time, the literary depictions of Lancelot reflect the ideals and culture of the medieval era.