Rosso assists for the first time in the cathedral Chapter and is accepted to receive the deaconate at the abbey of Sainte Geneviève at mass on Sunday, November 25, 1537.

Paris, National Archives, LL 140, p. 140.

Dominica XXVa predicti mensis et anni, reverendus dominus episcopus Calcedonensis promovit ad sacrum dyaconicatus ordinem dominum Rossium Johannem baptistam Rossi, subdiaconum parisiensem, in monasterio sancte Genovefe infra missarum solemna.¹