naphon, what means this trumpet's sound?

MENAPHON. Behold, my lord, Ortygius and the rest
Bringing the crown to make you emperor!

Re-enter ORTYGIUS and CENEUS, [22] with others, bearing a
crown.

ORTYGIUS. Magnificent and mighty prince Cosroe,
We, in the name of other Persian states [23]
And commons of this mighty monarchy,
Present thee with th' imperial diadem.

CENEUS. The warlike soldiers and the gentlemen,
That heretofore have fill'd Persepolis
With Afric captains taken in the field,
Whose ransom made them march in coats of gold,
With costly jewels hanging at their ears,
And shining stones upon their lofty crests,
Now living idle in the walled towns,
Wanting both pay and martial discipline,
Begin in troops to threaten civil war,
And openly exclaim against their [24] king:
Therefore, to stay all sudden mutinies,
We will invest your highness emperor;
Whereat the soldiers will conceive more joy
Than did the Macedonians at the spoil
Of great Darius and his wealthy host.

COSROE. Well, since I see the state of Persia droop
And languish in my brother's government,
I willingly receive th' imperial crown,
And vow to wear it for my country's good,
In spite of them shall malice my estate.

ORTYGIUS. And, in assurance of desir'd success,
We here do crown thee monarch of the East [;]
Emperor of Asia and Persia; [25]
Great lord of Media and Armenia;
Duke of Africa and Albania,
Mesopotamia and of Parthia,
East India and the late-discover'd isles;
Chief lord of all the wide vast Euxine Sea,
And of the ever-raging [26] Caspian Lake.

ALL. [27] Long live Cosroe, mighty emperor!

COSROE. And Jove may [28] never let me longer live
Than I may seek to gratify your love,
And cause the soldiers that thus honour me
To triumph over many provinces!
By whose desires of discipline in arms
I doubt not shortly but to reign sole king,
And with the army of Theridamas
(Whither we presently will fly, my lords,)
To rest secure against my brother's force.

ORTYGIUS. We knew, [29] my lord, before we brought the crown,
Intending your investion so near
The residence of your despised brother,
The lords [30] would not be too exasperate
To injury [31] or suppress you