The "fictional" Shakespeare

Some are born great,some achieve greatness,and others have greatness thrust upon them, quoth William Shakespeare.Or did he?Some people question whether Shakespeare really wrote the works that bear his name,or whether he even existed at all.They speculate that Shakespeare was a pseudonym for another writer,or a group of writers.Proposed candidates for the real Shakespeare include other famous playwrights, politicians and even some prominent women.Could it be true that the greatest writer in the English language was as fictional as his plays?