a.chash.ve.rosh is a proper name used for a king in Esther and Ezra and for Darius's father in Daniel.

The term is consistently a proper name in royal and court-related contexts: it identifies the king whose throne, provinces, decrees, and officials frame Esther, occurs in the opening reference to his royalty in Ezra, and names Darius's father in Daniel.

1. Proper name in royal and court settings · dominant

   All supplied tokens are tagged Noun · Proper. In Esther 1:2 the APB renders the clause with the king sitting on the royal throne in Susa; in Esther 3:12 an edict is written in his name and sealed with the king's ring. Ezra 4:6 places an accusation in the beginning of his royalty, while Daniel 9:1 identifies Darius as his son.

   Esther 1:2Esther 3:12Esther 8:10Esther 10:1Ezra 4:6Daniel 9:1

In the Anselm Project Bible: Across Esther, the APB commonly presents the name with “King” when the clause concerns his throne, commands, decrees, or kingdom. In Daniel 9:1 it appears in the phrase “son of Ahasuerus,” and Ezra 4:6 speaks of his “royalty”; these are verse-level renderings, not definitions.