* Thomas Kyd: Kyd was a contemporary of Shakespeare and a major figure in the Elizabethan theater. His play "The Spanish Tragedy" was a major influence on Shakespeare's tragedies, and its influence can be seen in Shakespeare's use of violence, revenge, and madness.
* Christopher Marlowe: Marlowe was another contemporary of Shakespeare and a major figure in the Elizabethan theater. His plays, such as "Tamburlaine" and "Doctor Faustus," were highly influential in the development of English drama. Shakespeare was likely familiar with Marlowe's work, and his influence can be seen in Shakespeare's use of language and imagery.
* Ovid: Ovid was a Roman poet whose works were well known in the Renaissance. Shakespeare was likely familiar with Ovid's work, and his influence can be seen in Shakespeare's use of mythology and his exploration of themes such as love, loss, and transformation.
* Seneca: Seneca was a Roman philosopher and playwright whose works were also well known in the Renaissance. Shakespeare was likely familiar with Seneca's work, and his influence can be seen in Shakespeare's use of rhetoric, his exploration of moral dilemmas, and his depiction of violent and bloody events.