(Gustaf Adolf), 1882–1973, king of Sweden (1950–73), son and successor of Gustavus V. After the death (1920) of his first wife, Princess Margaret of Connaught, he married (1923) Lady Louise Mountbatten (d. 1965). He participated in archaeological expeditions in Sweden, Greece, and China, and founded the Swedish Institute in Rome. A botanist, his work in that field gained his admission (1958) to the British Royal Academy. He was succeeded by his grandson, Carl Gustaf (King Charles XVI Gustavus).