par.si identifies Darius by his Persian designation in a royal-reign notice.

The attested use is a masculine singular Gentilic designation attached to Darius in the reign under which the priestly record is situated.

1. Designation attached to Darius · dominant

   In Nehemiah 12:22, the masculine singular Gentilic form qualifies Darius in the clause locating the priests' record under his reign; the APB renders the clause "under the reign of Darius the Persian."

   Nehemiah 12:22

In the Anselm Project Bible: In Nehemiah 12:22, the APB presents the designation in "Darius the Persian." The verse is read as a whole, but the clause clearly attaches it to Darius.