Our Lady manifested the Medal to Sister (now Saint) Catherine Laboure on November 27, 1830 in the motherhouse of the Daughters of Charity of St. Vincent de Paul and St. Louise de Marillac, in Paris. Vincentian Encyclopedia article
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<a href=http://famvin.org/cgi-bin/library?a=q&r=1&hs=1&e=p-000-00—0vincenti–00-0-0–0prompt-10—4——0-1l–1-en-50—20-about—00031-001-1-0utfZz-8-00&h=ddc&t=1&q=medal Vincentiana articles with Miraculous Medal in title