Conversation so far:
how did August Strindberg die?
During Christmas 1911, August Strindberg became sick with pneumonia and also began to suffer from stomach cancer symptoms.
how old was August Strindberg when he died?
August Strindberg died on 14 May 1912 at the age of 63.
did August Strindberg know he had stomach cancer?
Early signs of August Strindberg's stomach cancer had been felt in 1908.

Question: who attended his funeral?
Self-contained rewrite: who attended August Strindberg's funeral?