Kingdom of Eisenberg

The Kingdom of Eisenberg (鉄山の王国 Aizenberuku no Ōkoku) is a sovereign state ruled by the House of Eisenberg. It is highly advanced in science and technology, and is home to Eisenberg Industries, the world's leading manufacturer of armor and weapons.

Eisenberg Industries
Eisenberg Industries is an industrial company founded and owned by Sigismund Eisenberg. It is the world's leading manufacturer of armor and weapons, renown for mass-producing high quality equipment, both traditional and technologically enhanced.

Etymology
鉄山 Tetsuzan is Japanese for "iron mountain," a literal translation of Eisenberg, which comes from German eisen, "iron," and berg, "mountain."