In this Spanish name, the first or paternal surname is Montero and the second or maternal family name is Ríos.

Eugenio Montero Ríos (13 November 1832 Santiago de Compostela – 12 May 1914 Madrid) was a leading member of the Spanish Liberal Party before being part of a 1903 schism that divided it. He also served briefly as Prime Minister of Spain. He played a role in the 1898 Treaty of Paris that ended the Spanish–American War as he was then President of the Senate of Spain.

References