Which one?
John S. Ott, _Bishops, authority, and community in northwestern Europe, c. 1050-1150_ (Cambridge University Press, announced for early this year) says this in a Google Books preview at pp. 42-43 <http://tinyurl.com/zht9enn>:
"Illustrative are the bequests of two Alulfs, members of the Osmont clan of Tournai,... The first Alulf, who was dean of Tournai until _c._ 1082, was married and had at least four sons, who as part of their paternal inheritance shared until 1101 the revenues
of a mill owned by the cathedral chapter. The second Alulf's wealth was displayed in his gift of several houses and an altar to the chapter of Tournai in 1105."
A footnote (no. 69) at the end of that last sentence cites Ott's sources: Jacques Pycke, _Le Chapitre cathédral de Tournai de la fin du XIe à la fin du XIIIe siècle_, pp. 114-115, 137; idem, _Répertoire biographique des chanoines de Notre-Dame de Tournai, 1080-1300_, no. 1, 3; no. 123, 163-164.
Best,
John Dillon