On 27 November 1895, Alfred Nobel signed his last will and testament, giving the largest share of his fortune to a series of prizes, the Nobel Prizes. As described in Nobel's will, one part was dedicated to "the person who shall have made the most important discovery within the domain of physiology or medicine". Learn more about the Nobel Prize in Physiology or Medicine from 1901 to 2011.
http://www.nobelprize.org/nobel_prizes/medicine/shortfacts.html