Romanorum

Alphonsus Ciaconius, Vitae et Res Gestae Pontificum Romanorum et S.R.E. Cardinalium (ab Augusto Olduino recognitae) Tomus II (Roma 1677), 185 where it is alleged that Henry actually struck Teobaldo.

Augustus Potthast, Regesta pontificum Romanorum II (Berlin 1875), p. 943. As Cardinal de' Fieschi, Sinibaldo had been on friendly terms with Frederick, even after his excommunication.

In 1508, Pope Julius II allowed Maximilian I to use the title of Emperor without coronation in Rome, though the title was qualified as Electus Romanorum Imperator ("elected Emperor of the Romans").

The story of the three caskets can be found in "Gesta Romanorum", a collection of tales probably compiled at the end of the 13th century.