Ivo Helory, T.O.S.F. (pia: Yvo, Yves, Ives, Erwan, Iwan, Youenn au Eozenn; Kermartin, karibu na Tréguier, Brittany, Ufaransa Kaskazini-Magharibi, 17 Oktoba 1253 - Louennac, karibu na Tréguier, 19 Mei 1303) alikuwa msomi aliyepata kuwa padri mwadilifu aliyejitahidi sana kusaidia maskini, kutetea wanyonge na kuleta amani kati ya watu. Alitangazwa mtakatifu na Papa Klementi VI mnamo Juni 1347. Sikukuu yake inaadhimishwa tarehe 19 Mei. Watakatifu wa Agano la Kale Orodha ya Watakatifu Wakristo Orodha ya Watakatifu wa Afrika Orodha ya Watakatifu Wafransisko Martyrologium Romanum: ex Decreto Sacrosancti oecumenici Concilii Vaticani II instauratum auctoritate Ioannis Pauli P.P. II promulgatum, Romae 2001, ISBN 8820972107 His vita is in the Acta Sanctorum, col. 735. Vauchez, André (1993). in Daniel E. Bornstein: The Laity in the Middle Ages: Religious Beliefs and Devotional Practices. Notre Dame: University of Notre Dame Press. . Wigmore, John H., "St. Ives, Patron Saint Of Lawyers", 5 Fordham L. Rev. 401 (1936) Vie de saint Yves, bibliographie, hagiographie et tradition manuscrite Sur PECIA Ressources en médiévistique