"Глава всех зол": законы против предательства в "Семи Партидах"
In the article are analyzed the laws of the "Siete Partidas" of Alphonse the Wise directed against the treason. The author stressed the paper of the treason in the medieval world, its reputation of the worst of all the crimes, which had, besides pure juridical, also the theological connotations. About the problem of the genesis of the high treason, the author proved its Roman issues, first of all, the crimen laesae maiestatis and the crimen perduellionis. Also, he noted that this crime also had a Germanic element expressed in the notion of fidelity. An appendix to the article contains a commented translation into Russian of the correspondent section of the "Siete Partidas".