The book contains relevant primary sources (fuentes documentales primarias) on the history of Spain and its colonies. This is part of a multi-volume collection from the Archivo General de Simancas (the first official associated with the Spanish colonial engagement in the Philippines. The monograph features important personalities like Magallanes, Elcano, Legaspi, Urdaneta, Salcedo, Cobo, Sendeño, P.[adre] Sanchez, P.[adre] Moraga, Corcuera, Verastegui, Fajardo, Bustillos, Villanueva, Ducos, Gastambide, Anda, Blanco, Urbiztondo, etc. in the style of a vignette.(Lars Raymund C. Ubaldo, Ph.D.) archive of the Crown of Castille established in 1540) Chronologically arranged, each volume contains copies of reales ordenes (royal orders), cartas (letters), relaciones (reports), minutas (memoranda), apuntes (notes), etc. (Lars Raymund C. Ubaldo, Ph.D.)