ˌɔn fˈɪftiːn dʒˈuːn wˈʌn θˈaʊzənd tˈuːhˈʌndɹɪd fˈɪftiːn ðə kˈɪŋ ɐɡɹˈiːd tə mˈæɡnə kˈɑːɹɾə, ænd ˈɑːksfɚd wʌz wˈʌn ʌv twˈɛntifˈaɪv bˈæɹənz ᵻlˈɛktᵻd tə ɡˌæɹəntˈiː ɪts əbzˈɜːvəns, ænd wʌz ðˈʌs ɐmˌʌŋ ðoʊz ɛkskəmjˈuːnᵻkˌeɪɾᵻd baɪ pˈoʊp ˈɪnəsənt ɹˌoʊmən θɹˈiː wɛn hiː ɹᵻlˈiːst ðə kˈɪŋ fɹʌm ɪts tˈɜːmz.
On 15 June 1215 the King agreed to Magna Carta, and Oxford was one of twenty-five barons elected to guarantee its observance, and was thus among those excommunicated by Pope Innocent III when he released the King from its terms.