GUILLAUME [I] de Grantmesnil (-[before 1114]). Orderic Vitalis names “Rodbertum, Guillelmum, Hugonem, Ivonem, Albericum” as the sons of “Hugo de Grentemaisnilio” and his wife “Adelidem filiam Ivonis comitis de Bellomonte”[375]. Orderic Vitalis records that King William I offered “neptem suam Rodberti...Moritolii comitis filiam” in marriage to Guillaume de Grantmesnil, who refused and left for Apulia[376]. Europäische Stammtafeln states that he was in Apulia from 1081[377], although the basis for this is not known as it is not possible to date the passage in Orderic which is quoted above. Orderic Vitalis states that he was "avunculus" of Arnoul de Montpinçon, whose "acquisitions" inspired the latter to set out for Apulia[378]. Orderic Vitalis also records that he took part in Robert Guiscard's campaign against Durazzo in 1081 and that he was summoned by Duke Robert to his deathbed[379]. He was granted land in the valleys of the Crati, the Coscile and at Cotrone[380], although it is not known whether this refers to part of the "fifteencastles" of his wife's dowry (see below) or whether they were grants made to Guillaume in his own right before his marriage. Either way, it is clear that Guillaume's career in Apulia must have been particularly successful for him to haverisen from a relatively obscure background and to have made such a prominent marriage. Orderic Vitalis records that in Jun [1098] “Willelmus...de Grentemaisnil et Albericus frater eius, Guido Trussellus et Lambertus Pauper”, fearing for their safety if the Turks recaptured Antioch, escaped from the city by attaching ropes to the walls, after which they were all to their shame called “furtivi Funambuli” for the rest of their lives[381]. Albert of Aix records that "Willelmus Carpentarius, Willelmusque alter, quondam familiaris et domesticus imperatoris Constantinopolis, qui et sororemBoemundi principis Siciliæ uxorem duxerat", escaped "out offear" from Antioch to Alexandretta, believing that the crusading army wasdoomed after it was besieged by Kerbogha atabeg of Mosul, dated to mid-1098 from the context[382]. Orderic Vitalis records that Guillaume died in Apulia after returning “de Antiochia”[383]. From the context, the date of his death appears to have been before 1114. Europäische Stammtafeln[384] refers to "1130" but the source to which this relates has not so far been found. m (Apulia [1088/1089]) MABEL of Apulia, daughter of ROBERT "Guiscard/Weasel" de Hauteville Duke of Apulia & his second wife Sichelgaita of Salerno. Orderic Vitalis records that “Rogerus...Crumena id est bursa [dux] Calabriæ” arranged the marriage of “Mabiliam sororem suam” to “Guillelmo de Grentemaisnil”, after reaching a settlement with his [half-brother] Marco Bohemond, dated to [1088/89][385]. In a later passage, Orderic names her "Mabiliam...Curta-Lupa" and specifies that her dowry consisted of fifteen castles[386]. "La contessa Mabilia, vedova del protosebasta Guglielmo di Grantmesnil ed il figlio Guglielmo" donated the church of San Pietro di Bragalla to Cava by charter dated Sep 1117[387]. Guillaume & his wife had two children