(perhaps) Erizzo, Sebastiano. Le Sai Giornate (1567). Avvenimento II.

(perhaps) Pasquier, Étienne. Les Recherches de la France (pr. 1560-5). 1596 edtn., Bk. 5, Chs. 12, 16.

Petrarch. Epistolae Familiares (pr. 1601). 1.101-2.

REFERENCE : John Henry Walker, ed. Charlemagne, or, the Distracted Emperor. Malone Society Reprints. Oxford: Oxford University Press, 1937 [1938]. ix-x.