Ignorantia sacerdotum

"Ignorantia Sacerdotum" are the first words, and also the more well-known title, of "De Informatione Simplicium", a catechetical manual drafted by Archbishop Pecham's provincial Council of Lambeth in 1281. It called for the memorization of the Apostle's Creed, the Ten Commandments, and the two-fold injunction to "love the Lord thy God with all thy heart... and thy neighbor as thyself."

It also emphasized the Seven Virtues, the Seven Deadly Sins, the Seven Sacraments, and the Seven works of mercy.

A 1357 translation into English is often called the Lay-Folk's Catechism.

References

Duffy, Eamon. "". New Haven: Yale University Press, 1992. 55, 6.