A royal anthem is a patriotic song,citation needed much like a national anthem but specifically praising, or praying for, a monarch or royal dynasty. Such anthems are usually performed at public appearances by the monarch or during other events of royal importance. Some countries have the royal anthem be the national anthem as well; others keep them separate.
"Боже, Царя храни", translated as "God Save the Tsar" or more literally as "God, Keep the Tsar", the national anthem of the Russian Empire until 1917. It is some circles of the Russian diaspora.
"Ὕμνος εἰς τὴν Ἐλευθερίαν", translated as "Hymn to Liberty" the royal anthem of Greece until 1974 and after, the nathional anthem.
"Bože pravde", an earlier version of the Anthem of Serbia during the Kingdom, glorifying the King.