Jeanne (Joan) of Navarre, [106], [121], [134], [194], [246].

John I. (Roux), [189], [194].

John II., [204].

John III. (Bon), [67], [160], [205].

John IV. (Victorieux), [25], [67], [71], [119], [121], [126], [160], [185], [223], [246].

John V., [88], [121], [185].

Josselin, Château, [211].

Jugon, [61], [187].

Kergrist, Château, [96].

Kermartin, [84].