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Eustace was definitely Ida's son. The evidence comes from a charter dated 1096: "Ego Ida Boloniensis comitissa...in idipsum filiis meis Godefrido, Eustachio et Balduino mihi cooperantibus" (I, Countess Ida of Boulogne...together with my sons Godfrey, Eustace, and Baldwin). See Opera diplomatica et historica, ed. Miraeus & Foppens, Vol. I.
In a charter of Eustace III dated 1122, we find: "Ego Eustacius, Dei gratia, Boloniensium comes...matrisque mee Yde, comitisse, et fratrum meorum Godefridi, Ierosolomitani regis, atque Balduini, qui ei in regno successit". (I, Eustace, by the grace of God, Count of Boulogne...my mother countess Ida, et my brothers Godfrey, King of Jerusalem, and Baldwin, who reigned in succession.). See Cartulaire de l'abbaye de Saint-Bertin, ed. Guérard, 1840.Missi08:19, 10 September 2005 (UTC)[reply]