It said that Satoshi lost the first forum which he was using a to post about bitcoin development. A SourceForge forum. That Sirius (could it be this Cyrus) provided hosting for the present day Bitcointalk we know.
Cyrus and
sirius are different person.
Thank you for proving me link to
sirius. I checked the profile and I discovered that he did not get much merits and trusts like Theymos and Satoshi. It was only Theymos that trusted him as "co-creator of bitcointalk"
Good, I clicked the link to the sourceforge but it is not reachable again. Since the first is no longer existing, it is correct to say that the one existing is the oldest.