Neostoicism is a philosophical movement that emerged in the late 16th century, blending elements of Stoicism and Christianity. It was primarily developed by the philosopher Justus Lipsius, who sought to adapt ancient Stoic principles to contemporary religious and moral contexts. Neostoicism emphasizes the importance of inner virtue, self-control, and rationality in facing life's challenges. The movement gained popularity during the Renaissance, influencing various thinkers and writers. Neostoicism encourages individuals to cultivate resilience and maintain a sense of peace amid external turmoil, drawing on the Stoic belief in accepting what cannot be changed while striving for personal improvement.