From 1900-1902, 1923-1930, and 1978-, the paramount leader refers to the Prime Minister for simplicity. From 1931-1939, the paramount leader and head of state refer to the President of Spain for simplicity. Other than the period 1939-1975, the head of state refers to the monarch
Red represents the Spanish Socialist Workers' Party, purple represents the Republican Action Party, and dark red represents the Republican Left Party
Blue represents the People's Party, light blue represents the Conservative Union, and dark blue represents the Liberal Conservative Party
Green represents the Union of the Democratic Centre, dark green represents the Liberal Republican Right Party, and light green represents the Liberal Party
Yellow represents the monarchy and orange represents the military or the Movimiento Nacional