'Royal' in the Bible

The king spoke to Ashpenaz the master of his eunuchs, that he should bring in [certain] of the children of Israel, even of the seed royal and of the nobles;

At the end of twelve months he was walking in the royal palace of Babylon.

The king spoke and said, Is not this great Babylon, which I have built for the royal dwelling place, by the might of my power and for the glory of my majesty?

All the presidents of the kingdom, the deputies and the satraps, the counselors and the governors, have consulted together to establish a royal statute, and to make a strong decree, that whoever shall ask a petition of any god or man for thirty days, except of you, O king, he shall be cast into the den of lions.