Alongside tragedy, European humanists also adapted the ancient comedic tradition and as early as the 15th century, Renaissance Italy had developed a form of humanist Latin comedy. Although the ancients had been less theoretical about the comedic form, the humanists used the precepts of Aelius Donatus (4th century A.D.), Horace, Aristotle and the works of Terence to elaborate a set of rules: comedy should seek to correct vice by showing the truth; there should be a happy ending; comedy uses a lower style of language than tragedy; comedy does not paint the great events of states and leaders, but the private lives of people, and its principal subject is love.