Ángel Ruiz de Obregón y Retortillo was a Spanish historian and writer, best known for his work on the early explorations of the Americas. His most notable work, 'Vasco Núñez de Balboa: historia del descubrimiento del Océano Pacífico,' provides a detailed account of the life and achievements of Vasco Núñez de Balboa, the first European to see the Pacific Ocean from the New World. Through meticulous research and vivid storytelling, Obregón y Retortillo illuminated the significance of Balboa's expeditions and his role in the Spanish conquest of the Americas. Obregón y Retortillo's writings reflect the historical context of the early 20th century, a time when interest in colonial history and exploration was resurging. His contributions to the understanding of Spanish exploration have been recognized for their depth and narrative style, which not only chronicles events but also delves into the motivations and consequences of these explorations. His work remains an important resource for scholars and readers interested in the era of exploration and the complex history of European interactions with the Americas.