Fernando Pessoa (Fernando António Nogueira Pessoa) was a Portuguese poet, born in Lisbon, that went under several names, personalities and styles (each one of them according to a personality).
Heteronyms:
Alberto Caeiro
Ricardo Reis (Saramago wrote a novel about this one)
Álvaro de Campos
Himself under his own name.

They all had differente worldviews but almost all of them were a bit pessimistic, existentialist or agnostic.
Source(s):
http://en.wikipedia.org/wiki/Fernando_Pessoa
I've read some of his works (including poems for children that were pessimistic and kind of gloomy or creepy).

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He was a portugese writer, though if I remember correctly, he didn't do a whole lot. Early 1900s.
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Fernando Pessoa was a poet, and a writer. His father died when he was five, his brother died a year later, and his mother remarried.
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