According to the links in his profile, he has the wrong parents conencted:
https://de.wikipedia.org/wiki/Arnold_I._%28Kleve%29
"As the second Count of Kleve, Arnold I succeeded in expanding the territories of his father Dietrich I"
Dietrich is also listed as his father on these sites:
https://gw.geneanet.org/cvpolier?lang=en&iz=0&p=arnold+i.&a...
https://www.findagrave.com/memorial/114324488/arnold_i-von_kleve
https://en.wikipedia.org/wiki/Dietrich_I,_Count_of_Cleves
In fact, Medlands lines it out where you see Dietrich I had son Arnold who had sons Dietrich and Arnold. The confusion seems to come in because of the mention in the info below of Thiedericus who was a witness listed, not a member of the immediate family these connections are for. If you just focus on who the fathers and their children were, it's very clear:
DIETRICH [I] (-before 7 Mar 1120). Graf von Kleve. Otto Abbot of Werden confirmed that the abbey had acquired “curtim Hintisle contra domnum Liupponem nobilem virum” by charter dated 1092, witnessed by "De nobilibus comes Thiedericus de Cleue, comes Godefridus de Cappenberge et Wigboldus et Bernhardus homines eius..."[1881]. Otto Abbot of Werden confirmed the donation of "ecclesie…Dale…[et] ecclesie…Lopenhild" made by "nobilis…Thuringus…et uxori sue…Reinguiz…et filie…Bertrade", after his only son was killed in battle "contra Fresones", by charter dated 1093, signed at "Mulenheim in placito Bernheri comitis, suscipiente traditionem comite de Cleve Thiderico, vice advocati ecclesie nostre Adolfi qui tunc temporis puer erat" and witnessed by "comes Thiedericus…"[1882]. Graf von Tomburg. Hermann [III] Archbishop of Köln donated “decaniam...in Auelgoe” to Kloster Siegburg by charter dated 13 Dec 1096 witnessed by "Milites: Gerhardus de Hostaden, Gozuinus, Thieodericus de Toneburc, Godescalcus"[1883]. Friedrich [I] Archbishop of Köln founded Kloster Siegburg at the request of the citizens of Remagen by charter dated 1117 witnessed by "Albertus comes Norvenich, comes Teodericus de Ara, comes Teodericus de Tuneburch, Almarus advocatus de Colonia…"[1884]. Friedrich [I] Archbishop of Köln confirmed donations to Kloster Dunwald and shared the Vogteischaft with "comitis Adolphi" by charter dated 1118 witnessed by "Adolfus comes de Monte et frater eius Euerhardus, Gerardus comes de Wassenberg […et filius eius Gerardus], Theodericus comes de Thonburch, Theodericus comes de Ara, domnus Goswinus de Hennesberg et frater eius Gerardus…Gerardus de Wyckerode…"[1885]. m ---. The name of Dietrich’s wife is not known. Dietrich [I] & his wife had one child:
a) ARNOLD [I] von Kleve (-20 Feb after 1146, bur Bedburg). Friedrich [I] Archbishop of Köln divided the church of Zyfflich by charter dated 1117 witnessed by "Godefridus dux, Fridericus comes de Arnesberg, Arnoldus de Clive, Heinricus comes de Sutuene…"[1886]. "Comes Arnaldus" indicated to Arras Saint-Vaast the resignation of "in pago Bathuano...ministrum Theodericum" for maladministration, referring to events "tempore patris meis comitis Theoderici", dated 16 Feb 1120[1887]. "Gerardus de Gelre, Arnoldus comes de Berge, Waleramus comes de Lemburg, Gerardus comes de Iuliaco…" signed the charter dated 1085 under which Friedrich Archbishop of Köln donated property to Kloster St Martin, Köln[1888]. Graf von Kleve. Friedrich [I] Archbishop of Köln issued a charter dated 1117 relating to the church at Zufflich witnessed by "Godefridus dux, Fridericus comes de Arnesberg, Arnoldus de Cliue, Henricus comes de Sutuene"[1889]. Friedrich [I] Archbishop of Köln donated Kloster Rolandswerth on an island in the river Rhine to Kloster Siegburg by charter dated 1 Aug 1126 witnessed by "Tiedericus comes de Are, Adolfus comes de Berge, Adolfus comes de Safenberg, Arnoldus comes de Cleue, Cunradus comes de Bunna, Gerardus comes de Iuleche et filius eius Gerardus, Gerardus comes de Hostade…"[1890]. Lothar King of Germany donated property to Köln St Cunibert by charter dated 10 Feb 1129 witnessed by "…Comites: Gerhardus de Gellere, Arnoldus de Thonoburg, Gerhardus de Iulicho, Herimannus de Caluala, Henricus de Kessile, Adolphus de Berge, Adolphus de Saphinberg, Liberi: Gerhardus de Hostadin, Gerhardus de Heimesberg, Ludowicus de Quinheim, Gerhardus de Mulinarco, Gerhardus de Randirode…"[1891]. Lothar King of Germany confirmed property of Duisburg by charter dated 8 May 1129 witnessed by "…Comites: Gerhardus Longus de Gelere, Arnoldus de Cliue, Hermannus de Caluerlage, Hermannus de Salmene, Otto de Rinecke, Florentius de Hollande, Gerhardus de Hostad, Bernhardus de Hildenesheim, Godefridus et Hermannus de Cuch, Adolfus de Berge…"[1892]. Konrad III King of Germany dismissed claims by "comes Adelbertus de Noruenich" to property "in silva…Osninch" claimed from Kloster Brauweiler by charter dated 14 Sep 1141, witnessed by "…comes Arnoldus de Cleuia, comes Adolfus de Monte, comes Heinricus de Gelra, comes Adolfus de Saphenberch, Gerardus puer comes de Iuliaco, Godefridus de Arnesberch, Herimannus de Cuich…"[1893]. Vogt of Stift Xanten and Zyfflich. "Theodericus comes in Cleue et Aleidis uxor mea" donated property to Kloster Bedburg, for the anniversaries "X Kal Mar…patris mei Arnoldi comitis et VI Kal Aug matris mee Ide comitisse", by charter dated 1162[1894]. Philipp Archbishop of Köln granted protection to Kloster Bedburg, founded by "Arnoldus comes de Cliue", by charter dated to [1167/77] witnessed by "Henricus comes de Gelre et filius eius Gerardus…"[1895]. m IDA de Louvain, daughter of GODEFROY I "le Barbu" Duke of Lower Lotharingia & his first wife Ida de Chiny (-27 Jul before 1162). The Genealogia Ducum Brabantiæ Heredum Franciæ names (in order) "Alaida…Anglorum regina…comitissa de Cleves Ida…[et] Clarissia virgo" as the three daughters of "Godefridus Cum-barba"[1896]. "Theodericus comes in Cleue et Aleidis uxor mea" donated property to Kloster Bedburg, for the anniversaries "X Kal Mar…patris mei Arnoldi comitis et VI Kal Aug matris mee Ide comitisse", by charter dated 1162[1897]. Arnold [I] & his wife had [three] children:
i) ARNOLD [II] von Kleve (-after 1134). The primary source which confirms his parentage has not yet been identified. Iuvenis 1134. [m BERTA, daughter of --- (-8 Apr ----).]
ii) DIETRICH [II] von Kleve (-[27 Apr] 1172). "Theodericus…comes in Clivis, Arnoldi comitis et Ide comitisse filius" donated property by charter dated 1163[1898]. Graf von Kleve.
- see below.
iii) [daughter . One table in Europäische Stammtafeln records “N v Kleve T v Gf Arnold I” as the wife of Eberhard Graf von Altena[1899]. The primary source which confirms her parentage and marriage has not yet been identified. m EBERHARD Graf von Altena, son of ADOLF [II] Graf von Berg & his second wife [Irmgard von Sponheim/--- von Schwarzenberg] (-23 Jan 1180, bur Altenberg).]
DIETRICH [II] von Kleve, son of ARNOLD I Graf von Kleve & his wife Ida de Louvain (-[27 Apr] 1172). "Theodericus…comes in Clivis, Arnoldi comitis et Ide comitisse filius" donated property by charter dated 1163[1900]. Graf von Kleve. "Theodericus comes in Cleue et Aleidis uxor mea" donated property to Kloster Bedburg, for the anniversaries "X Kal Mar…patris mei Arnoldi comitis et VI Kal Aug matris mee Ide comitisse", by charter dated 1162[1901]. “...Theodericus comes de Cleve...” witnessed the charter dated 1166 under which Reinald Archbishop of Köln confirmed privileges of Kloster Althoff[1902]. The Annales Egmundani record the death in 1172 of "Theodericus comes de Cleve"[1903].
m ADELHEID von Sulzbach, daughter of GEBHARD [III] Graf von Sulzbach & his wife Mathilde of Bavaria (-10 Sep 1189). "Theodericus comes in Cleue et Aleidis uxor mea" donated property to Kloster Bedburg, for the anniversaries "X Kal Mar…patris mei Arnoldi comitis et VI Kal Aug matris mee Ide comitisse", by charter dated 1162[1904]. "Theodericus…comes de Cliuo" donated the island between Wissel and Rees on the river Rhine to Kloster Camp, with the consent of "matre nostra comitissa Aleide et fratre nostro Arnoldo", by charter dated 1188[1905]. Gerhard Abbot of Camp confirmed the donation of property made by "comitissa Aleidis de Cliuo", for "defunctis patris eius comitis Geuehardi et comitis Theoderici", by charter dated to [1188][1906].
