Leo Tolstoy (1828-1910) was a Russian writer widely regarded as one of the greatest novelists in world literature. His masterpieces include "War and Peace" and "Anna Karenina", which are often cited as pinnacles of realist fiction. Tolstoy's works are known for their complex characters, insightful portrayal of society, and profound philosophical reflections on morality and spirituality. Later in life, he became a prominent moral and religious thinker, advocating for nonviolent resistance and social justice.