Sebastian Undiano y Gastelu

Sebastian Undiano y Gastelu appears to have been a 19th-century Spanish-language author associated with Proyecto de traslacion de las fronteras de Buenos Aires al Rio Negro y Colorado, a work preserved by Project Gutenberg and listed by major library catalogs.

Reliable public sources provide very little personal information about him. Bibliographic records such as the Bibliothèque nationale de France and Memoria Chilena identify him as an author, but the available pages do not confirm fuller details like his birth and death dates, profession, or a broader body of work.

Because the record is so sparse, he is best introduced through the historical subject of his writing: frontier policy in Argentina and the proposed movement of the border toward the Río Negro and Colorado. For readers, that makes his surviving work valuable less as a window into a famous literary career than as a glimpse into the ideas and debates of its time.