Narrative:
The derivation of this name is uncertain. It was invented by poet Chrétien de Troyes in his 12th-century version of the Arthurian legends. Percival's virtue was so great, according to Chrétien, that he alone could expect to retrieve the Holy Grail.
Science and Philosophy
Percival Lowell (born 1855, died 1916)
American astronomer.
Predicted the existence of Pluto based on mathematical calculations; wrote several works on Mars and its ''''canals'''' (see list of Mathematicians, Physicists & Astronomers)