On 22 December 1880, Isa concluded a protectorate treaty with the United Kingdom to abstain from making any treaties or engagements with any other foreign power or state without British consent.
ˌɔn twˈɛnti tˈuː dᵻsˈɛmbɚ wˈʌn θˈaʊzənd ˈeɪthˈʌndɹɪd ˈeɪɾi, ˈɪsə kəŋklˈuːdᵻd ɐ pɹətˈɛktɚɹˌeɪt tɹˈiːɾi wɪððə juːnˈaɪɾᵻd kˈɪŋdəm tʊ ɐbstˈeɪn fɹʌm mˌeɪkɪŋ ˌɛni tɹˈiːɾiz ɔːɹ ɛŋɡˈeɪdʒmənts wɪð ˌɛni ˈʌðɚ fˈɔːɹən pˈaʊɚ ɔːɹ stˈeɪt wɪðˌaʊt bɹˈɪɾɪʃ kənsˈɛnt.