These horrors are not, for the most part, of Shakespeare's invention.
An entry in Henslowe's diary of April 11, 1592, mentions for the first time a play named Titus and Vespasian ("tittus and vespacia"), which was played very frequently between that date and January 1593, and was evidently a prime favourite. In its English form this play is lost; no Vespasian appears in our Titus Andronicus. But about 1600 a play was performed in Germany, by English actors, which has been preserved under the title, Eine sehr klägliche Tragœdia von Tito Andronico und der hoffertigen Kayserin, darinnen denckwürdige actiones zubefinden, and in this play a Vespasian duly appears, as well as the Moor Aaron, under the name of Morian; so that, clearly enough, we have here a translation, or rather a free adaptation, of the old play which formed the basis of Shakespeare's.
We see, then, that Shakespeare himself invented only a few of the horrors which form the substance of the play. The action, as he presents it, is briefly this:—
Titus Andronicus, returning to Rome after a victory over the Goths, is hailed as Emperor by the populace, but magnanimously hands over the crown to the rightful heir, Saturninus. Titus even wants to give him his daughter Lavinia in marriage, although she is already betrothed to the Emperor's younger brother Bassianus, whom she loves. When one of Titus's sons opposes this scheme, his father kills him on the spot.
In the meantime, Tamora, the captive Queen of the Goths, is brought before the young Emperor. In spite of her prayers, Titus has ordered the execution of her eldest son, as a sacrifice to the manes of his own sons who have fallen in the war; but as Tamora is more attractive to the Emperor than his destined bride, the young Lavinia, Titus makes no attempt to enforce the promise he has just made, and actually imagines that Tamora is sincere when she pretends to have forgotten all the injuries he has done her. Tamora, moreover, has been and is the mistress of the cruel and crafty monster Aaron, the Moor.
At the Moor's instigation, she induces her two sons to take advantage of a hunting party to murder Bassianus; whereupon they ravish Lavinia, and tear out her tongue and cut off her hands, so that she cannot denounce them either in speech or writing. They remain undetected, until at last Lavinia unmasks them by writing in the sand with a stick which she holds in her mouth. Two of Titus's sons are thrown into prison, falsely accused of the murder of their brother-in-law; and Aaron gives Titus to understand that their death is certain unless he ransoms them by cutting off his own right hand and sending it to the Emperor. Titus cuts off his hand, only to be informed by Aaron, with mocking laughter, that his sons are already beheaded—he can have their heads, but not themselves.
He now devotes himself entirely to revenge. Pretending madness, after the manner of Brutus, he lures Tamora's sons to his house, ties their hands behind their backs, and stabs them like pigs, while Lavinia, with the stumps of her arms, holds a basin to catch their blood. He bakes their heads in a pie, and serves it up to Tamora at a feast given in her honour, at which he appears disguised as a cook.
In the slaughter which now sets in, Tamora, Titus, and the Emperor are killed. Ultimately Aaron, who has tried to save the bastard Tamora has secretly borne him, is condemned to be buried alive up to the waist, and thus to starve to death. Titus's son Lucius is proclaimed Emperor.
It will be seen that not only are we here wading ankle-deep in blood, but that we are quite outside all historical reality. Among the many changes which Shakespeare has made in the old play is the dissociation of this motley tissue of horrors from the name of the Emperor Vespasian. The part which he plays in the older drama is here shared between Titus's brother Marcus and his son Lucius, who succeeds to the throne. The woman who answers to Tamora is of similar character in the old play, but is Queen of Ethiopia. Among the horrors which Shakespeare found ready made are the rape and mutilation of Lavinia and the way in which the criminals are discovered, the hewing off of Titus's hand, and the scenes in which he takes his revenge in the dual character of butcher and cook.
The old English poet evidently knew his Ovid and his Seneca. The mutilation of Lavinia comes from the Metamorphoses (the story of Procne), and the cannibal banquet from the same source, as well as from Seneca's Thyestis. The German version of the tragedy, however, is written in a wretchedly flat and antiquated prose, while Shakespeare's is couched in Marlowesque pentameters.