ɹᵻdʒˈɪnɑːɹ ɪnhˈɛɹɪɾᵻd hɪz fˈɑːðɚz pɹɪkˈɛɹiəs pəzˈɪʃən æz kˈaʊnt ʌv mˈɑːnz, wˌɪtʃ wʌzɐ pˈɑːɹt ʌv hˈeɪnɔːt, ænd θɹuː hɪz mˈæɹɪdʒ tʊ ɐ mˈɛmbɚɹ ʌv hɪz fˈæmɪliz tɹɐdˈɪʃənəl ˈɛnəmiz, ðə hˈaʊs ʌv ɑːɹdˈɛn, hiː nˌɑːt ˈoʊnli kənsˈɑːlᵻdˌeɪɾᵻd ðæt pəzˈɪʃən, bˌʌt ˈɔːlsoʊ ɡˈeɪnd kˈɑːmɪɾəl stˈæɾəs ɪnðə nˈeɪbɚɹɪŋ saʊθwˈɛstɚn pˈɑːɹt ʌv bɹˈæbənt.
Reginar inherited his father's precarious position as count of Mons, which was a part of Hainaut, and through his marriage to a member of his family's traditional enemies, the House of Ardenne, he not only consolidated that position, but also gained comital status in the neighbouring southwestern part of Brabant.