Fidelium Iura / Research magazine that was published between 1991 and 2005. Until 1998 it was published as a supplement to the magazine Persona y Derecho. From 1999 it appears as a Yearbook dependent on the Martín de Azpilcueta Institute . In the first number (1991) it appeared under the heading "Lex Nova". The main content of the magazine deals with the fundamental rights and duties of the faithful.