Research Notes:

Rozoy-sur-Serre is located in the present-day French département of Aisne, north-west of Rethel. In 877, Rozoy lay within the sphere of influence of the newly-founded abbey of Compiègne Saint-Corneille: Charles I “le Chauve” King of the West Franks founded the abbey of Compiègne, and recorded donations including the donation of “in pago Noviomensi...duas partes decimæ de Andriaco villa...Cincinniaco, Aminiaco, Vienna, Roseto, Salmuntiaco, Antiniaco...”, by charter dated 5 May 877. In the early 11th century, Rozoy was under the jurisdiction of the kings of the West Franks under the lordship of the ecclesiast Helgaud whose tomb at Laon Saint-Vincent records “Hilgaudus dominus de Roseto clericus”. Adalbero Bishop of Laon confirmed that “homo devotus Hilgadus” founded the church of Saint-Laurent “in Rozeti suo allodio”, with the authorisation of “principibus Francorum Roberto”, by charter dated 1018, quoted in a charter dated 1114. No further corroborated reference to a seigneur de Rozoy has been found until the appearance of Clarembaud in a charter dated 1129, as shown below. Clarembaud must have been a personage of some prominence in his local area to have married the widow of the comte de Rethel, who was also the daughter of the comte de Namur. No indication has been found of his parentage or earlier background. Boeren discusses the properties of the seigneurie de Rozoy and how they were inherited by the Oudenaarde/Rethel/Louvain families after the death of Roger [II] Seigneur de Rozoy.

Seigneur de Rozoy. “Clérembaud et sa femme seigneurs de Rozoy” consented to donations “situés à Pommereux et à Moranzy, commune d’Agnicourt” to Laon Saint-Martin by charter dated 1129. The Breve Chronicon Buciliensis records that “Clarembaldus de Roseto” donated property to Bucilly in 1135. "Gofridus...de Ribodi-monte et Ansellus filius eius, Henricus comes [...Novi-castri], Clarembaudus et Elisabeth uxor eius" founded the monastery of Signy "in territorio Signiacensi et apud sanctum Petrum super Veel, Libercei, Membiis, Drezia et Harlivilla", and confirmed the donations of land “in...Roseto” by “Clarembaldus” by charter dated 1135. The bishop of Laon confirmed donations made to Tournai Saint-Martin by “Clarembaldus de Roseto” in compensation for damage caused, for the souls of himself “et filii sui Roberti”, by charter dated 1142. ¹