WILLEM [I] van Egmond (-killed Stadingherlant 17 May 1234). His parentage is confirmed by Beke's Egmondsch Necrologium which records the death of his father "dominus Walterus de Egmonda…pater domini Wilhelmi et Gherardi militum"[420]. Willem I Count of Holland donated property “bona nostra in Buckescop a Domino Giselberto de Amestel” to Rijsburg abbey, recording also a donation made by “filiis domini Ecberti de Amestel”, by charter dated 1222, witnessed by “...Wilhelmus de Ecmunda”[421]. "Balduinus comes de Benthem, Wilhelmus de Egmonde, Jacobus castellanus de Leydeu…" witnessed the charter dated May 1223 under which Floris IV Count of Holland "et Theodoricus dominus de Voirne, castellanus Zelandie" held court at Westkappel[422]. Hendrik abbot of Egmond granted the advocacy of the abbey to "domino nostro Wilhelmo" by charter dated Dec 1226[423]. "Isbrandus de Hairlem…Willelmus de Egmonda, Walterus de Hairlem, Isbrandus de Egmunda…" witnessed the charter dated 23 Apr 1230 under which Arnold abbot of Egmond confirmed a donation made by "Werenboldus filius Vastradi" out of the inheritance of "Adalberti de Haghe patrui sui"[424]. "Henricus de Vorne…Willelmus de Egmund…Machtildis comitissa, Richard soror comitis" witnessed the charter dated 1231 under which Floris IV Count of Holland confirmed rights of Rijnsburg abbey[425]. Beke's Egmondsch Necrologium records that "dominus Wilhelmus de Egmonda" who built "capellam…in Rijneghem" was killed "in Stadingherlant XVII die Maii" 1234[426]