I am very interested in Fernando Pessoa and his influence on Portuguese poetry, literature and indeed mystical thought.  His relationship to Crowley however is little covered apart from a few newspaper clippings here and there, for example:

http://www.guardian.co.uk/books/2008/jul/20/news.poetry

http://www.nytimes.com/2008/07/15/arts/design/15abroad.html?_r=2&oref=slogin&

So it was with great interest that I came across these two papers.  My apologies if these have been posted already (I did a search but could not find them)

Fernando Pessoa and Aleister Crowley: New discoveries and a new analysis of the documents in the Gerald Yorke Collection
http://www.brown.edu/Departments/Portuguese_Brazilian_Studies/ejph/pessoaplural/Issue1/PDF/I1A08.pdf

September 1930, Lisbon; Aleister Crowley’s lost diary of his Portuguese trip
http://www.brown.edu/Departments/Portuguese_Brazilian_Studies/ejph/pessoaplural/Issue1/PDF/I1A07.pdf

Can anyone point me to further information?

Of interest is the fact that Ofiússa or Ophiussa is the name given by the ancient Greeks to the Portuguese territory and it translates as 'Land of Serpents'.

The ofis would live mainly in the mountains of northern Portugal, including Galicia. Others say that they lived at the mouth of the rivers Douro and Tagus. These people were said to worship serpents, so being THE LAND OF SERPENTS.

In the 4th century, the Roman poet and explorer Rufus Festus Avienus (or Avieno Rufus Festus) wrote a document later titled Ora Maritima, a document inspired by a sea voyage to "Oestriminis" (or far west). Oestrimni was said to be populated by a people who lived in that area for a long time, who had to flee their land after an "invasion of serpents." This may be a relation to Saephe or ofis ("the people of the serpents") and Dragani ("the people of Dragons"), who came to colonize these lands and formed a territory known to the Greeks as Ophiussa. Some authors relate the people Ofi with the Druids or proto-Celtic or even ancient Egyptians.

The expulsion of Oestrimni, the Ora Maritima

Ophiussam usque ad. rursum ab huius litore
internum ad Aequor, Wed mare is insinuare
dixi ante Terris, quodque Sardum nuncupant,
septem dierum tenditur pediti route.
Ophiussa porro so panditur latus
Quantam iacere Pelopis Audis insulam
Graiorum in agri. HAEC dicta cousin Oestrymnis est
loci et arva Oestrymnicis habitantibus,
post serpens fine effugavit incolas
vacuamque glaebam nominis fecit sui.

Back after the places we spoke of above,
there opens a great bay filled with water,
all the way to Ophiussa. Back from the shore of this place,
to the inland water, through which I said before that the sea insinuates itself
through the land, and which they call Sardum,
the journey extends for seven days on foot.
Ophiusa extends its side, being as large
as you hear the Island of Pelops
lying in the territory of the Greeks is. This land was originally called Oestrymnis
by those who inhabited the Oestrymnian countryside and region,
much later the serpent chased away the inhabitants
and gave the now empty land its name

The history is indeed fascinating:

"The Lusitanians worshipped various gods in a very diverse polytheism, using animal sacrifice. They represented their gods and warriors in rudimentary sculpture. Endovelicus was the most important god: his cult eventually spread across the Iberian peninsula and beyond, to the rest of the Roman Empire and his cult maintained until the 5th century; he was the god of public health and safety. The goddess Ataegina was especially popular in the south; as the goddess of rebirth (Spring), fertility, nature, and cure, she was identified with Proserpina during the Roman era. Lusitanian mythology was related to Celtic mythology, and during later Roman rule it also became heavily influenced by Roman mythology, as Romans also started venerating Lusitanian gods. Runesocesius, the javelin god, was also an important god, and often formed the supreme trinity in the Lusitanian pagan religion with Endovelicus and Ataegina." - Wiki

Lusitanian Gods:

Abna
Aernus
Aetio
Albucelainco
Ambieicris
Arabo
Aracus
Arentia
Arentio
Ares Lusitani
Ataegina - Ataecina - Atégina
Bandua - Bandue - Bandi
Bandonga
Bormanicus (Borvo)
Cabuniaegenis
Candeberonio
Cariocecus
Carneus
Cauleces
Collouesei
Coronus
Coruae
Coso
Debaroni Muceaigaego
Dercetius
Duberdicus
Durius
Endovelicus
Edovio
Eniragillo
Epona
Erbina
Frovida
Igaedo
Ilurbeda
Laepo
Laho
Laneana
Laraucus
Lucubo
Lurunis
Miraro Samaco
Moelio
Moricilo
Munidis
Nabia
Netaci
Neto
Ocaere
Quangeio
Reo
Reue
Runesocesius
Sucellus
Sulae Nantugaicae
Tameobrigus
Toga
Tongoe
Tongoenabiagus
Torolo Gombiciego
Trebaruna
Turiacus
Trebopala
Verore
Vestio Alonieco

"PORTUGAL is a being. This entity has to fulfill a destiny.  " - Fernando Pessoa