Alberto Raúl Esteban Ribas is a historian and economist. He has studied a doctorate in military history. He is a specialist in the military history of Spain, from the 16th-17th centuries. He has written several books on Spanish battles and military expeditions, as well as numerous articles for Spanish and international magazines. His current line of research focuses on the study of the Spanish armies and campaigns of the second half of the 17th century, considered the period of Spanish decline, and analyzing the reasons for such a situation.