Who is Matilde Urruita from Pablo Neruda: Selected Poems and what is their importance?

Matilde Urruita was the third wife of Pablo Neruda, and to whom he was married at the time of his death. She was the inspiration behind his publication 100 Love Sonnets, which was published anonymously in order to spare the feelings of his previous wife from whom he was separating. In his poem Autumn Testament, which reads like Neruda's last will and testament, there is a long section dedicated to her entitled, finally he addresses himself ecstatically to his beloved. Neruda says that his love for her is a "child crying" afraid to leave her arms. The poem is a beautiful statement and remembrance of the passion the two shared, and it also gives us an interesting insight into their relationship.