The Imperial Court sensed a threat from Nobunaga who had been increasing his power day by day and, in order to measure Nobunaga's loyalty to the Imperial Court, sent in 1582 a letter from the Imperial Prince Sanehito that read 'You may have any official position that you wish to have.' to Nobunaga (Sanehito Shinno Goshosoku (letters of the Imperial Prince Sanehito)).
日ごとに権力を増す信長に脅威を抱いた朝廷は、信長の朝廷に対する忠誠心を計るため、天正10年（1582年）に「いか様の官にも任ぜられ」（どのような官位も望みのままに与える）と記された誠仁親王の親書（誠仁親王御消息）を送る。