Andrew the Chaplain or Andreas Capellanus (c. 1150-c. 1220) was a thinker who in the 12th century wrote a scientific and practical treatise commonly called De Amore ('On Love') and often referred to as The Art of Courtly Love, although its realistic and slightly cynical tone suggests that it is in some respect an antidote to courtly love. Very little is known about the life of Andreas Capellanus, but it is presumed that he was part of the court of Mary of France, and was probably of French origin.