regnal
/ˈrɛɡn(ə)l
/adjective [attributive]
Of a reign or monarch: she organizes her material by regnal periods...
- An odd handful, notably Buckingham Palace and the Vatican, survive in regnal use; the rest exist purely as public museums.
- A new challenge arose when Bessus, who had withdrawn to his satrapy, proclaimed himself King of Kings under the regnal name Artaxerxes V.
- According to tradition, Numa was the great civil and sacred lawgiver of regnal Rome.
Origin
Early 17th century: from Anglo-Latin regnalis, from Latin regnum 'kingdom'.