The Trve Lawe of free Monarchies: Or, The Reciprock and Mvtvall DvtieBetwixt a free King, and his naturall Subiectes

The Reciprocal and Mutual Duty Betwixt a Free King and His Natural Subjects (original Scots title: The Trve Lawe of free Monarchies: Or, The Reciprock and Mvtvall Dvtie Betwixt a free King, and his naturall Subiectes) is a treatise or essay of political theory by James VI of Scotland (later to be crowned James I of England too).1 

It is believed James VI wrote the tract to set forth his idea of kingship, in contrast to the contractarian views espoused by, among others, George Buchanan (in De Jure Regni apud Scotos, 1579). 

James VI had the work published in 1598. It is considered remarkable for setting out the doctrine of the Divine Right of Kings in Scotland, and latterly England, for the first time. 

James saw the Divine Right of Kings as an extension of the apostolic succession.

The state of monarchy is the supremest thing upon earth, for kings are not only God's lieutenants upon earth and sit upon God's throne, but even by God himself they are called gods. There be three principal [comparisons] that illustrate the state of monarchy: one taken out of the word of God, and the two other out of the grounds of policy and philosophy. In the Scriptures kings are called gods, and so their power after a certain relation compared to the Divine power. Kings are also compared to fathers of families; for a king is truly parens patriae [parent of the country], the politic father of his people. And lastly, kings are compared to the head of this microcosm of the body of man.