What Other Evidence Do We Have That William Shakespeare Did Write These Plays?

His name is on 39 title pages across 16 plays, and the two narrative poems from 1593 and 1594 name them as author. A special notice might be made of Shakespeare's sonnet 1609 never before imprinted. In one of the plays about Parnassus Anonymous, one of the characters says, Oh, sweet Master Shakespeare, I'll have his picture in my study at court. We might notice corroborative evidence such as Shakespeare's theatrical shareholding,. He's acting in plays by other people, for example, Ben Johnson's plays.