Tolong jelaskan mengenai Catatan dari Foulque Nerra

Bachrach, Bernard S. Fulk Nerra, the Neo-Roman Consul, 987-1040: a Political Biography of the Angevin Count. University of California Press, 1993.

Erdoes, Richard. AD 1000: Living on the Brink of Apocalypse, 1988

Fichtenau, Henry. Living in the Tenth Century, 1991.