Why is the character amaranta significant to the book ?

Amaranta is the daughter of Jose Arcadio Buendia and Ursula Iguaran. She never marries and spends most of her life consumed in personal bitterness towards Rebeca, who first gained the attentions of Pietro Crespi. Amaranta eventually drives Pietro Crespi to suicide and wears a black bandage for the rest of her life in contrition. Lonely all her life, she has relationships with her nephew and great-great-nephew that are tinged with incestuous feelings. She receives a preminition of death many years before and dies perfectly prepared and perfectly at peace.