Masamune explained to Hideyoshi that the letter of instigating the ikki revolt was a forgery, then he was forgiven; however, he was order to transfer from the Yoneyama-jo Castle to the Iwate-jo Castle in Tamatsukuri District after the decision to reduce his territory to 580,000 koku; the name of the castle was changed to the Iwadeyama-Jo Castle since then.
一揆扇動の書状は偽物である旨秀吉に弁明し許されるが、米沢城から玉造郡岩手沢城に58万石に減らされての転封となり、城名を岩出山城に変えた。