Willem I GERULFING, Count of Holland
- Born: The Hague, Zuid-Holland, Netherlands
- Married (1): 1197, Stavoren, Friesland
- Married (2): Jul 1220
- Died: 4 Feb 1222
 Research Notes:
The Chronologia Johannes de Beke names (in order) "Theodricum succedentem comitem Hollandie, Wilhelmum comitem Orientalis Frisie, Florencium prepositum Traiecetensis ecclesie, Robertum presidium Kenemarie, Beatricem, Elizabeth, Adelheydim et Margaretam comitissam Clivie" as the children of Count Floris III & his wife. "Theodericus Hollandie comes…comitis Florentii et Ade comitisse filius" donated property at Poeldijk bij Naaldwijk to the church of St Maria, Utrecht by charter dated 1198, in the presence of "Ada mater mea, Willelmus frater meus comes Frisie, Margareta soror mea, Florentius frater meus…". The Chronologia Johannes de Beke records that "Wilhelmum comitem" was received "in Orientalis Frisia" after his marriage. The Gesta Episcopum Traiectensium names "Theodericum comitem Hollandie fratrem suum Wilhelmum" when recording the disagreement between the two brothers.
He succeeded his niece in 1203 as WILLEM I Count of Holland. The Chronologia Johannes de Beke records that "Wilhelmus comes Orientalis Frisie" conspired after the death of his brother Count Dirk VII in 1203, with the support of "Florencius frater suus Traiectensis prepositus, Otto comes de Benthem ipsius patruus" and others, against "Ludovicum comitem de Loon…ac Adelheidim Hollandie viduam", in a later passage recording that "Ludovicus comes de Loen" was defeated and expelled from Holland, after which Willem succeeded as count. Matthew Paris records that “duos...capitaneos Willelmum...Houlandiæ ducem et comitem de Weiz Georgium” besieged “Alchaciam” after landing at Lisbon in 1217.
The Chronologia Johannes de Beke records the death "1223 II Non Feb" of Count Willem. 1
Marriage Information:
Willem married Adelheid VAN GELRE, daughter of Gf. Otto I VAN GELRE and Richardis VON WITTELSBACH, in 1197 in Stavoren, Friesland. (Adelheid VAN GELRE died on 4 Feb 1218 and was buried in Rijnsburg, Zuid Holland.)
Marriage Information:
Willem also married Marie DE BRABANT, daughter of Henri I "le Guerroyeur" (the Warrior) DE LOUVAIN, Duke of Lorraine & Brabant, and Mathilde DE FLANDRE, Duchess of Brabant, in Jul 1220. (Marie DE BRABANT was born about 1191 and died after 9 Mar 1260.)
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