Sir,
I persuade myself you cannot be ignorant how the affairs in this kingdom stand at this time in general, and in particular of North Wales; that the town and castle of Caernarfon is surrendered for the use of the parliament, as likewise the Castle of Beaumaris, and the whole island of Anglesey, submitted thereunto; so that your holding of the Castle of Denbigh from its due obedience (having no hope of relief) can produce no other probable effect that the ruin of your country, which heretofore you have been accounted so good a patriot that you have been very tender of. For the prevention whereof, and the shedding of Christian blood, wishing you not forget yourself and estate, which I do assure you, if you persist but a few days more, in the way you are in, will be to put the uttermost hazard. I do hereby summon you once more to deliver into my hands the Castle of Denbigh, for the use of the king and parliament. And that you may seriously consider of it, I do allow you time till Saturday noon, to return, and then expect your answer.
Your servant
Thomas Mytton.
Lleweny, 24th day of June 1646