Andrés Manuel del Rio, Spanish-Mexican scientist and discoverer of vanadium (d. 1849)
Andrés Manuel del Río y Fernández (10 November 1764 – 23 March 1849) was a Spanish–Mexican scientist, naturalist and engineer who discovered compounds of vanadium in 1801. He proposed that the element be given the name panchromium, or later, erythronium, but his discovery was not credited at the time, and his names were not used.