From John Calvin’s first sermon on 1 Timothy 2:1-2:
Because all the principalities of this world are are, as it were, a figure and image of the kingdom of our Lord Jesus Christ, we must esteem them as precious and pray to God to preserve them, and make them prosper.
I say first of all, lawful kingdoms. When a man is under a Prince or under Magistrates in a free city, he must also pray to God for them.
But yet there is more, that is to say, that they which are under tyrants must especially pray for them, insomuch as they govern and hold the place of justice.