Floris IV, Count of Holland

Floris IV (24 June 1210 – 19 July 1234), Count of Holland from 1222 to 1234. He was born at The Hague, a son of William I of Holland and his first wife, Adelaide of Guelders.

Floris IV succeeded his father in 1222. His regent was Baldwin of Bentheim. He acquired the Land of Altena. He had constant disputes with the bishop of Utrecht, Otto of Lippe, but helped him against the peasants of Drenthe in 1227. Floris fought against the Stedingers north of Bremen in 1234.

On 19 July 1234, he was killed at a tournament in Corbie, France. He was buried at Rijnsburg Abbey.

Family and children
He married before 6 December 1224 Matilde of Brabant, daughter of Duke Henry I of Brabant and Mathilde of Flanders also referred to as Maud of Boulogne and Alsace. Their children were:
 * 1) William II, Count of Holland (1227–1256).
 * 2) Floris de Voogd (ca. 1228–1258), Regent of Holland in 1256–1258.
 * 3) Adelaide of Holland (ca. 1230–1284), married, in Frankfurt am Main in 1246, Jean I of Avesnes, Count of Hainaut. Their descendants eventually inherited Holland. She was Regent of Holland in 1258–1263.
 * 4) Margaret (d. 1277), married c. 1249 to Count Herman I of Henneberg.
 * 5) Mechtild