HOUSE OF THE FOREST OF LEBANON (Heb. הַלְּבָנוֹן בֵּית יַעַר, Beit Ya'ar ha-Levanon), one of the buildings included the complex of Solomon's palace in Jerusalem; probably served as the entrance to the king's palace. The building was named for its cedar pillars, which were imported from Mt. Lebanon and resembled a forest. Several scholars maintain that the house served as a royal guardhouse, containing rooms used as arsenals; this is attested by 1 Kings 10:17–21 and Isaiah 22:8 .

[https://www.encyclopedia.com/religion/encyclopedias-almanacs-transcripts-and-maps/house-forest-lebanon]