 The term was not used in the concluding chapter of the apostolic constitution "Lumen gentium" of the Second Vatican Council, which chapter many theologians hold to be a comprehensive summary of Roman Catholic Mariology.Some, in particular the adherents of the Amsterdam visions, have petitioned for a dogmatic definition, along with "Mediatrix", but recent high-level comments in the Church have not encouraged these hopes.On April 7, 2017, the Congregation of the Mother Coredemptrix was renamed to the Congregation of the Mother of the Redeemer upon the recommendation of the Congregation for the Evangelization of Peoples, due to the "theological ambiguity" of the title Coredemptrix.