Research Notes:

The Genealogia Comitum Flandrić Bertiniana, dated to the second decade of the 12th century, names "Balduinum Ferreum" as son of "Audacer". The Genealogia Comitum Flandrić names "Balduinum Ferreum" as son of "Audacer". He is named as son of Audacer in the list of counts of Flanders recorded in the Cartulaire de Saint-Bertin, which records his year of death and place of burial. His birth date range is estimated on the assumption that he was a young adult at the time of his marriage, which means that he must have been a child when his father died. He eloped with his future wife around Christmas 861. The Annales Blandinienses name "Baldwinum Ferreum filium Audacri" and "Balduvinus filius Audacri" when recording (respectively) his abduction of his wife in 862 and his death in 879. He was granted the “pagus Flandrensis” in 863, and shortly after Ternois, Waas and the lay abbacy of St Peter of Gent...

He is known to history as BAUDOUIN I “der Gute/Ferreus/der Eisenarme” Count of Flanders, but it is improbable that he was referred to as such by contemporaries. An agreement dated 14 Jun 877 of Emperor Charles II "le Chauve", presumably written with his own death in mind, names "…ex comitibus aut Tedericus, aut Balduinus, sive Chuonradus, seu Adalelmus" as those willing to support the emperor's son.

The Annales Blandinienses record the death in 879 of "Balduvinus, filius Audacri", specifying that he was buried at "Blandinie". According to legend, he built the church of St Donatien ("Sint Donaatskapittel") at Bruges. ²