José de la Riva-Agüero y Osma, 6th Marquess of Montealegre de Aulestia and 5th of Casa-Dávila was a Peruvian lawyer, historian, writer, essayist and politician who served as Prime Minister of Peru, Minister of Justice and Mayor of Lima. He was a leading member of the so-called Generation of 900, a conservative ideological movement of the early 20th century that also included other important member of Peruvian society, such as Víctor Andrés Belaúnde, Francisco García Calderón Rey, Óscar Miró Quesada de la Guerra and José Gálvez Barrenechea.

The president of the Council of Ministers of Peru, informally called Premier or Prime Minister, is the head of the cabinet as the most senior member of the Council of Ministers. The president of the Council of Ministers is appointed by the president of Peru.