The third-level plot concerns the uncle of Mistress Peregrine and Jacinta, Sir Solitary Plot, "a character compounded of Jonson's Morose in Epicene and Jonson's Sir Politic Would-Be in Volpone."
Sir Solitary Plot, the uncle of Mistress Peregrine and Jacinta, is featured in the third-level plot. He is derived from a blend of characters: Jonson's Morose from Epicene and Jonson's Sir Politic Would-Be from Volpone.