Antonio de Pineda y Ramirez was both a military officer and scientist for the Spanish crown, being most famous for his botanical research. Heading the scientific expedition under the auspices of King Carlos III, he sailed across the world collecting data in different countries, which eventually lead him to the Mariana Islands in 1792. After spending twelve days on Guam, he observed both the geological and zoological aspects of Fort Santo Angel, a small fortification at the entrance to Umatac Bay. Shortly after his departure from Guam, he passed away, leaving behind valuable scientific information about the island.