
Throughout the later Middle Ages, the County of Holland was consumed by partisan fighting. These factions, the Hooks and Cods, arose from a power struggle between Margaret of Avesnes and her son William I of Bavaria. The fight between mother and son would only last a few years, but the factional strife would continue for over a century.
Time Period Covered: 1299 – 1417
Notable People: John II of Avesnes, William II of Avesnes, Margaret of Avesnes, William I of Bavaria, Jan Van Arkel Bishop of Utrecht, Albert of Bavaria, William II of Bavaria, Jan V Van Arkel
Notable Events: Bavarian Inheritance of Hainault-Holland-Zeeland, Formation of the Hook and Cod factions, The Hook and Cod Wars, The Arkel War

Sources
The Formation of A Political Union 1300-1588 by Wim Blockmans in History of the Low Countries Edited by J.C.H. Blom and E. Lamberts
A History of the Low Countries by Paul Arblaster
The Chronicle of Holland, Zeeland, and Friesland with the Chronicle of the Bishops of Utrecht by Cornelius Aurelius
The Empire: From Adolf of Nassau to Lewis of Bavaria by Peter Herde in The New Cambridge Medieval History Volume VI
The Low Countries 1290-1415 by Walter Prevenier in The New Cambridge Medieval History Volume VI
The Promised Lands by Wim Blockmans and Walter Prevenier
The Princely Court: Medieval Courts and Culture in North-West Europe 1270-1380 by Malcolm Vale