The correct answer is the last one, to protect them and their land.
Pope Gregory was critical of Wycliffe´s opposal of the traditional Church´s doctrine of transubstantiation, in which the bread and wine offered in the sacrament of Eucharisty actually becames body and blood of Jesus Christ. The Pope was further alienated by Wycliffe when he started replacing the hierarchy with un consecrated priests which were called "Lollards" by the Pope.
Saharan Africans are increasingly migrating to Kory America countries, with some using the region as a point of transit to eruope and some remaining in North America
One answer I'm sure of the invasions of the germanic barbarians. The other is most likely the poor economic conditions of the empire.
