<Tr> <Td> </Td> <Td> This article may contain improper references to self - published sources . Please help improve it by removing references to unreliable sources, where they are used inappropriately . (March 2015) (Learn how and when to remove this template message) </Td> </Tr> <P> In Greek mythology, Nessus (Ancient Greek: Νέσσος) was a famous centaur who was killed by Heracles, and whose tainted blood in turn killed Heracles . He was the son of Centauros . He fought in the battle with the Lapiths and became a ferryman on the river, Euenos . </P> <P> Nessus is known for his role in the story of the Tunic of Nessus . After carrying Deianeira, the wife of Heracles, across the river, he attempted to force himself upon her . Heracles saw this from across the river and shot a Hydra - poisoned arrow into Nessus's breast . As he lay dying, as a final act of malice, Nessus told Deianeira that his blood would ensure that Heracles would be true to her forever, knowing the blood to be infected with the hydra's poison . </P> <P> Deianeira foolishly believed him . Later, when her trust began to wane because of Iole, she spread the centaur's blood on a robe and gave it to her husband . Heracles went to a gathering of heroes, where his passion got the better of him . Meanwhile, Deianeira accidentally spilled a portion of the centaur's blood onto the floor . To her horror, it began to fume by the light of the rising sun . </P>

Why does deianira send heracles the robe with nessus' blood on it
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