His views on future contingents were controversial, being opposed by Henry of Zomeren, also at Leuven (French: Louvain).
[1] De Rivo went to Rome in 1472 to defend his views to Pope Sixtus IV; they were condemned in 1473.
[2] Under pressure from the influence of Cardinal Bessarion to whom Henry had as secretary,[3] de Rivo retracted partially his opinions in 1473, and more fully three years later.
[4] This meant that views going back at least to Peter Auriol, that future contingents lacked a truth value, had become heretical in the view of the Catholic Church.
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