Baianism is a term applied to the theology of Catholic theologian Michael Baius (1513-1589). It claims thorough Augustinianism over the scholasticism which held sway over most Catholic theologians at the time. It is the immediate historical predecessor of Jansenism, and with Jansenism it has been deemed non-orthodox by the Catholic Church.
Read more about Baianism: Michel Baius (Michel De Bay), Baianist Doctrine, Catholic View, Source