Machiavelli works through Livy's history of early Rome book by book, drawing out the practical lessons for building and preserving a free republic.
Books mentioned in Discourses on the First Decade of Titus Livius (1)
History of Rome (Ab Urbe Condita) by Livy: “I desire to adduce one other, recorded by Titus Livius in his history, where he relates that a sister of Aruns having been violated by a Lucumo of Clusium”