monarchize

To rule; to govern

As Britain-founding Brute first Monarchiz’d the Land:

We must confesse, she can all Soules subdue,

To convert to a monarchy.

[…] so far we shall be from mending our condition by monarchizing our government, whatever new conceit now possesses us.

1800, Thomas Jefferson, letter to Gideon Granger dated 13 August, 1800, in Richard S. Poppen (ed.), Thomas Jefferson: The Declaration of Independence and Letters, Addresses, Excerpts and Aphorisms, St. Louis, Missouri, 1898, p. 72, [Our government] can never be harmonious and solid, while so respectable a portion of its citizens support principles which go directly to a change of the Federal Constitution to sink the State governments, consolidate them into one, and to monarchize that.

To act or play the part of a monarch.

[…] within the hollow crown That rounds the mortal temples of a king Keeps Death his court and there the antic sits, Scoffing his state and grinning at his pomp, Allowing him a breath, a little scene, To monarchize, be fear’d and kill with looks […]

1600, Thomas Dekker, Old Fortunatus, London: William Aspley, [Act I, Scene 3], Uice hath golden cheekes, O pittie, pittie, She in euery land doth monarchize. Uertue is exilde from euery Cittie, Uertue is a foole, Uice onely wise.