十三佛

The thirteen Shingon rulers of the dead during the forty-nine days and until the thirty-third commemoration.　The thirteen are 不動明王, 釋迦文殊, 普賢, 地藏, 彌勤, 藥師, 觀音, 勢至, 阿彌陀, 阿閦/, 大日and 虛空藏; each has his place, duties, magical letter, signs, etc.