And ye shul bothe anon unto me swere
That nevere mo ye shal my contree dere,
Ne make werre upon me nyght ne day,
But been my freendes in all that ye may.
– Geoffrey Chaucer
The Canterbury Tales, The Knight’s Tale. Theseus makes Palamon and Arcite swear that they will be his friends and never make war on him and never more harm his country.