The Reformers were upset with the Church over the sale of indulgences (paying money to cover sins). Which the Reformers felt was unBiblical.
Maryland was the refuge for catholics
According to Bernard of Clairvaux, the goal of the crusade was to battle the pagan Slavs "until such a time as, by God's help, they shall either be converted or deleted".
What do you need to know about the Indus River Valley people?