Queen Elizabeth II. Reigning monarch for over six decades, and the cornerstone of modern British history. Ascending to the throne after the untimely death of her beloved father, King George VI, she has seen the world change drastically, and faced a number of great challenges, both publicly and privately. Her inscrutable commitment to duty, above all else, has defined her lifetime of service to the throne. Take a look back at the incredible and incomparable life of Queen Elizabeth II.