Alix de Roucy - Sources?

Looks like an "oops" misidentification for "ADELAIS, daughter of BAUDOUIN de Soupir & his wife Machane ---. ".

MedLands: BOUCHARD de Guise (-after 1161). The Genealogiæ Scriptoris Fusniacensis names "Burgardum et Godefridum et sorores eorum" as childen of "Guidonem [de Guisia]"[445]. "Wido Lescheriensis…et Guisiensis" granted rights to the abbey of Saint-André du Câteau, for the souls of "meæ et coniugis meæ Adeluyæ", by undated charter, signed by "filiorum meorum Adam et Burgardi…" and later confirmed by the bishop of Laon by charter dated 1121 at the request of "Guido de Gusia rogatu uxoris suæ Adeluyæ et matris suæ Adæ" and with the consent of "filiis suis Adam et Burchardo"[446]. Seigneur de Guise. A charter dated 2 Mar 1133 confirms the donation of “castelli...Lescherii” donated to Laon Saint-Vincent by “Balduinus de Subpeio”, with the consent of “uxore sua Machania privignoque et eodem genero suo Burchardo de Gusia cum uxore sua Adelidi ipsius...Baldewini filia”[447]. The Breve Chronicon Buciliensis records that “Burchardus dominus de Guisia” granted rights to Bucilly, with the consent of “conjugis suæ Ælidis et Godefridi fratris sui”, in 1155[448]. m ADELAIS, daughter of BAUDOUIN de Soupir & his wife Machane ---. A charter dated 2 Mar 1133 confirms the donation of “castelli...Lescherii” donated to Laon Saint-Vincent by “Balduinus de Subpeio”, with the consent of “uxore sua Machania privignoque et eodem genero suo Burchardo de Gusia cum uxore sua Adelidi ipsius...Baldewini filia”[449]. The Breve Chronicon Buciliensis records that “Burchardus dominus de Guisia” granted rights to Bucilly, with the consent of “conjugis suæ Ælidis et Godefridi fratris sui”, in 1155[450]. Bouchard & his wife had one child:

a) ADELINE de Guise (-after 1200). The Chronicon Hanoniense names "Adelviam Buchardi de Guisa filiam" as wife of "Iacobum [filium Nicholai…de Avethnes]"[451]. The late 13th century genealogy by Balduinus de Avennis records that "Nicolai Plukelli filius primogenitus Jacobus" married "Adeluyam unicam filiam Bouchardi domini de Guisia"[452]. The Breve Chronicon Buciliensis records that “Adeluya domina Guisiæ” donated property to Bucilly in 1196 for the soul of “mariti sui Jacobi de Avenis”, with the consent of “Gualteri filii sui cæterorum liberorum suorum”[453]. “Jacobus dominus de Landreceis filius magni Jacobi domini de Avesnis et de Guisia” granted freedoms to the town of Landrecies, with the consent of “Addelinæ matris meæ et domini fratris mei Walteri de Avesnis et Nicolai de Etroeungt”, by charter dated 1200[454]. m ([1163/68]) JACQUES d'Avesnes, son of NICOLAS Seigneur d'Avesnes & his wife Mahaut de la Roche ([1150]-killed in battle Arsuf, Palestine 7 Sep 1191).
https://fmg.ac/Projects/MedLands/nfravalver.htm#AdelineGuiseMJacque...