Otto II, Count of Guelders
After Count William II (1227–1256) was slain in 1256 by Frisians his two-year-old son Floris V, Count of Holland inherited Holland. His uncle (Floris de Voogd regent from 1256 to 1258), and later his aunt (Adelaide of Holland regent from 1258 to 1263) fought over custody of Holland with other nobles. At the battle of Reimerswaal on 22 January 1263, Count Otto II defeated Aleidis and was chosen regent by the nobles who opposed Aleidis.
Otto II served as Floris V's guardian until he was twelve years old (1266) and considered capable of administering Holland himself.
- Elizabeth of Guelders, married Adolf VIII of Berg, no issue;
- Margaret of Guelders, married Enguerrand IV, Lord de Coucy, without progeny.
- Reginald I, Count of Guelders
- Phillipa of Guelders, married Waleran II, Lord of Valkenburg.
- Margaret of Guelders, married Dietrich VII, Count of Cleves.
- Maria of Guelders
- Lexicon geschiedenis van Nederland & Belgie. Mulder, Liek and Jan Brouwers eds. Utrecht; Antwerpen: Kosmos-Z&K, 1994
- Wi Florens--: de Hollandse graaf Floris V in de samenleving van de dertiende eeuw. De Boer, D.E.H., E.H.P. Cordfunke, H. Sarfatij, eds. Utrecht: Matrijs, 1996, pp. 24-29
- Medieval Battles in the Low Countries
- Butkens, C. (1724) Trophées tant sacrés que profanes du duché de Brabant (The Hague), Vol. I, Preuves, p. 82, "Lettre tirée des chartes de Brabant".
- Franconia from Medieval Lands
- Kronijk van Arent toe Bocop, p. 188.
| Count of Guelders