[4] He went to Orléans in 1277 to study canon law under Peter de la Chapelle, a famous journalist who later became bishop of Toulouse and a cardinal.

[3] On his return to Brittany, having received minor orders, he was appointed an "official", the title given to an ecclesiastical judge, of the archdeanery of Rennes (1280).

[3] Meanwhile, he studied Scripture, and there are strong reasons for believing the tradition held among Franciscans that he joined the Third Order of St. Francis sometime later at Guingamp.

He displayed great zeal and rectitude in the discharge of his duty and did not hesitate to resist taxation by the king, which he considered an encroachment on the rights of the Church.

It seemed that two of them, Doe and Roe, lodging with her, had left in her charge a casket of valuables, while they went off on their business, but with the strict injunction that she was to deliver it up again only to the two of them jointly demanding it.

So when the case was called before the Judge, and the merchant Roe charged the widow with breach of faith, "Not so", pleaded Ivo, "My client need not yet make answer to this claim.

The judge promptly approved his plea, whereupon the merchant, required to produce his fellow, turned pale, fell a-trembling, and would have retired.

The judge, suspecting something from his plight, ordered him to be arrested and questioned; the other merchant was also traced and brought in, and the casket was recovered; which, when opened, was found to contain nothing but old junk.

In short, the two rascals had conspired to plant the casket with the widow, and then to coerce her to pay them the value of the alleged contents.

For instance, the Society of St. Yves in Jerusalem (a Catholic Center for Human Rights and Legal Aid, Resources and Development),[8] the Conférence Saint-Yves [fr] in Luxembourg (the Luxembourg Catholic Lawyers Association), or the Association de la Saint Yves Lyonnais.

Shortly after 1362, the future saint Jeanne-Marie de Maillé reported a vision of Yves (and an ecstasy, raptus), during which he told her, "If you are willing to abandon the world, you will taste here on earth the joys of heaven.