The Lion in Winter is a 1968 historical drama centred on Henry II of England and his attempt to establish a line of succession during a family gathering at Christmas 1183. His efforts unleash both political and personal turmoil among his estranged wife Eleanor of Aquitaine, their three surviving sons, the French king, and the king's half-sister Alais, who is Henry's mistress. The film stars Peter O'Toole and Katharine Hepburn, was directed by Anthony Harvey, written by James Goldman, and produced by Joseph E. Levine, Jane C. Nusbaum, and Martin Poll. Actors John Castle, Anthony Hopkins, Jane Merrow, Timothy Dalton and Nigel Terry appear in support.

Peter Seamus O'Toole was an English stage and film actor. He attended RADA and began working in the theatre, gaining recognition as a Shakespearean actor at the Bristol Old Vic and with the English Stage Company. In 1959 he made his West End debut in The Long and the Short and the Tall, and played the title role in Hamlet in the National Theatre's first production in 1963. Excelling on the London stage, O'Toole was known for his "hellraiser" lifestyle off it.