area of present-day Iwaki was part of ancient Mutsu Province. The forms いわき, 石城, 岩城, 巖城, 巌城, and 磐城 are all ways of writing "Iwaki", which means "rocky castle"...

and Konan merged into the city of Kōriyama) October 1, 1966 Iwaki District (石城郡), Fukushima (The towns of Yotsukura, Ogawa, Tōno, the villages of Kawamae...