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.
Otto II, Count of Guelders was the son of Gerard III, Count of Guelders and Margaretha of Brabant.
Otto first married Margaret of Cleves in 1240. They had:
- Elizabeth of Guelders, married Adolf VIII of Berg
- Margaret of Guelders, married Enguerrand IV, Lord de Coucy
- 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
- Jensen 2017, p. 1121-1122.
- Grotius 2000, p. 91.
- Baldwin 2014, p. 28.
- Pollock 2015, p. xv.
- Baldwin, Philip Bruce (2014). Pope Gregory X and the Crusades. The Boydell Press.
- Grotius, Hugo (2000). Waszink, Jan; Holzapfel, Marieke; Kool, Wouter; Lahey, Michiel; van der Loo, Manon; Slootmans, Marina; de Wreede, Liesbeth (eds.). Liber de Antiquitate Reipublicae Batavicae. Van Gorcum & Comp.
- Jensen, Carsten Selch (2017). "Stedinger Crusades (1233–1234)". In Murray, Alan V. (ed.). The Crusades: An Encyclopedia. ABC-CLIO.
- Pollock, M. A. (2015). Scotland, England and France After the Loss of Normandy, 1204-1296: "Auld Amitie". The Boydell Press.
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