• Vader:
  Otto van Wickrath, zn. van Otto L. von Wickenrode en Aleydis van Wickerode, tr. in 1198 met

• Moeder:
  Margarethe "Widow of Wilhelm" von Montbéliard (Mömpelgard van Altena), dr. van Boudewijn van Altena en Margaretha van Bornem, geb. te Almkerk circa 1175, ovl. in 1245, tr. (1) met Wilhelm II (Willem) van Horne. Uit dit huwelijk 4 kinderen, tr. (2) met

tr.
met

Hermann van Merum, zn. van Koenraad van Merum en Heilwig van Rode, geb. te Merheijm [Duitsland] in 1085, ovl. te Merheijm [Duitsland] circa 1135, tr. met

Wilhelm II van Horne.
Willem [I] van Horne (-after 1189). Willem van Horne is named in a charter dated 1189 under which Rutger van Mereheim donated property to Kamp abbey before leaving on crusade. The register of the archives of Roermond include a reference to Theodericus aartsdiaken van Luik confirming the donation of Winricus mansus in Linna..rechten en allodia te Bemela made by Rutger van Mereheym to Kamp abbey on leaving for crusade, dated 1189 at Meerheim, witnessed by ..Willem van Hornen, Dirk van Altena en zijn zoon Boudewijn, de voogd van Roermond, Herman van Holcho.. ..Duo fratres de Hornen, Otto de Buren.. witnessed the charter dated 1191 under which Otto..comes Gelrie et Rychardis uxor mea donated property in curia Putten to Werden abbey. The names of the two brothers are not stated in the document but, from a chronological point of view only, it is possible that they were Willem [I] and Engelbert [III].
../..
--- van Horne . From a chronological point of view, it is possible that this person is the same as Willem [I] van Horne who is named above. If that is correct, it may help explain the joint appearance of members of the Horn and Altena families as witnesses to the 1189 document which is quoted above, assuming that this personþs wife was a member of the Altena family as suggested below. m [--- van Altena, daughter of ---. The documentation which suggests that the first wife of Dirk [III] van Altena was the paternal aunt of the two brothers Willem and Engelbert van Horne is discussed below. However, a contrary line of argument is indicated by a charter dated 7 May 1230, under which Theodoricus dictus dominus de Altena..et consanguineus meus Wilhelmus de Horne recognised castrum meum de Altena as a fief held from Floris IV Count of Holland. The word consanguineus suggests a blood relationship, not a relationship by marriage. If this is the correct interpretation of the second document, it suggests that Dirk [III] van Altena was the maternal uncle of the Horn brothers, their mother being Dirkþs sister. This appears to be supported by the charter dated 1235 under which Wilhelmus dominus de Hoirne confirmed avunculus meus..dominus Theodericus de Altena in possession of castri de Altena, assuming that avunculus should be interpreted in its strict sense of maternal uncle (which is far from certain). Wolters cites a charter dated 1244 which he quotes (in translation) as providing that Willem van Horne confirmed the donation of property by son oncle maternel Thierry Seigneur dþAltena to the abbey of Herckenrode. However, it is not known whether oncle maternel is the correct translation of the wording of the original charter which has not yet been seen. The hypothesis also appears corroborated by the succession of her grandson Willem [II] Heer van Horne as Heer van Altena after the death of Dirk [III] van Altena in [1241/47]. Two children:.
a) Willem [II] van Horne (-[1237/41]). Heer van Horne.
b) Engelbert van Horne.
Comte, de Hornes, Sieur, d'Altena, de Weert, de Nederweert, Grand-Veneur, du Saint Empire Romain Ger, Senhor de Horn, Altena, Heeze e Venloon. Tomou parte na Oitava Cruzada, na Batalha de Woeringen. Foi morto na Batalha de Zierikzee, Willem was heer van Horne van 1219 tot 1240 en heer van Helmond.
Willem I van Horne Willem I van Horne was een edelman uit het Huis Horne die leefde van 1200-1264. Hij was heer van Horn en ook onder meer van Helmond. In 1222 verkocht hij de heerlijkheid Helmond aan hertog Hendrik I van Brabant, waarna deze heerlijkheid onder invloed van de hertog van Brabant kwam. Hij trouwde in 1230 met Heilwig van Altena, zus van Dirk III van Altena en Boudewijn van Altena. Zij was een dochter van Dirk II van Altena van het kasteel Altena te Almkerk. Hun kinderen waren: Margaretha van Horne (1230-) Willem II van Horne (1240-1304) Engelbert van Horne (1242) Dirk IV van Horne (-1272) heer van Altena. Hij is kinderloos overleden. Huis Horne Heer van Horn Heer van Helmond.

Uit dit huwelijk een zoon: