ˈɪsɑːɹn wʌz ˌɪnstɹəmˈɛntəl baɪ hɪz ˌɪntɚsˈɛʃən wɪð ɹɐmˈoʊn bˈɛɹɛŋɡɚɹ ˈaɪ, kˈaʊnt ʌv bˌɑːɹsɪlˈoʊnə, ɪn əbtˈeɪnɪŋ ðə ɹᵻlˈiːs fɹʌm mˈʊɹɹɪʃ kæptˈɪvᵻɾi ʌvðə mˈʌŋks ʌv lˈeɪɹɪnz ˈæbi.
Isarn was instrumental by his intercession with Ramon Berenguer I, Count of Barcelona, in obtaining the release from Moorish captivity of the monks of Lérins Abbey.