 In the early thirteenth century, official support for some kinds of servitude was incorporated into Canon Law (Corpus Iuris Canonici), by Pope Gregory IX, .Slavery was imposed as an ecclesiastical penalty by General Councils and local Church councils and Popes, 1179–1535...

(a) The crime of assisting the Saracens 1179–1450...

(b) The crime of selling Christian slaves to the Saracens 1425.Pope Martin V issued two constitutions.