YVON, f"ven', PIERRE: Leader of the Labadists; b. at Montauban in the French province of that name (not at either of the cities of that name of the present time) in 1646; d. in 1707. As a child he was with his mother an attendant at the church of Labadie (see Labadie, Jean de, Labadists), and after Labadie removed to Geneva, Yvon was sent there to live with him and study under him. After pursuing courses in philosophy and theology, he took part in Labadie's work, followed him to Middelburg in 1668, and thence to Amsterdam, where Yvon became one of the most earnest propagandists of Labadie's ideas. In this interest he also visited Wesel, Duisburg, Mulheim, Düsseldorf, and Cologne, and also worked at The Hague and in Dort and Utrecht with some Success. In 1670 he went- with the Labadists to Herford. After the death of Labadie in 1674, Yvon became the recognized head of the community, and led them back into the fatherland in 1675, where the measure of success which attended the community for a time was changed into decay and decline after 1688.

Yvon was a man of power and devotedness, more sober than Labadie, better educated in theology, a diligent author, and ever full of zeal for the cause which he had espoused. His writings appeared in Latin, German, Dutch, and French; of these perhaps the best known is his Kurtzer Bericht von Zustand . . . derjenigen Personen welehe Gott . . . zu seinem Dienst vereiniget . . . hat, 1659, which ap peared in French, Amsterdam, 1681, and in Eng. transl., A Faithful Relation of the State anal Last Words . . . of Certain Persons whom God hath taken to Himself out of the Church, Amsterdam, 1685. (For list of minor writings cf. Hauck-Herzog, RE, xxi. 585-586).

(S. D. van Veen.)

Bibliography: Consult the literature under Labadie, Jean, Labadists; Actes publics tant politiques qu'ecel_aiaatiques des . . J. de Labadie et P. Yvon, Amsterdam, 1664; J. Koelman, Der Labadisten, ib. 1684; J. Reitsma. J. Hesener en Balthasar Cohlerua, in De Vrije Fries, xiii (1877).

YVONETUS, i"von-&ti3s: Dominican, the supposed author of a thirteenth-century Tradahta de

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haresi psuperum de Lugduno. The tract is found in E. Martke and N. Durand, Thesaurus novus anec dotorum, v. 1777 (Paris, 1717). The assumed authorship is stated by Pegna in his edition of the Directorium inquisitorum of Eymericus, pp. 229, 279 (Rome, 1587) and by D'Argentrd in Collectio judiciorum, i. 84, 95 (Paris, 1818), but assailed by F. Pfeiffer in Zeitschrift für deutsches Alterthum,1853, p. 55, who attributes the work to David of Augsburg (q.v.). Preger has made this sure in his edition of the manuscript extant at Munich in Abhandlungen der Berliner Akademie, xiv. 2 (1879), 183 sqq. Two other manuscripts exist, one at Strasburg and one at Stuttgart. See Waldenses.

(C. Schmidt.)

Bibliography: K. Müller, Die WaIdesaer, pp. 157 sqq., Gotha, 1886; KL, iii. 1844.