[1] After serving Hideyoshi for a time, Date Masamune was given Iwatesawa castle and the surrounding lands as his home domain.

Masamune moved there in 1591, rebuilt the castle, renamed it Iwadeyama, and encouraged the growth of a town at its base.

Masamune stayed at Iwadeyama for 13 years and turned the region into a major political and economic center.

[2] After the Meiji revolution, all the remaining structures of the castle were removed or destroyed.

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