From Clarendon’s History of the Rebellion

The character of Charles I:

‘To speak first of his private qualifications as a man, before the mention of his princely and royal virtues; he was, if ever any, the most worthy of the title of an honest man; so great a lover of justice, that no temptation could dispose him to a wrongful action, except it was so disguised to him that he believed it to be just. He had a tenderness and compassion of nature, which restrained him from ever doing a hardhearted thing; and therefore he was so apt to grant pardon to malefactors, that the judges of the land represented to him the damage and insecurity to the public, that flowed from such his indulgence. And then he restrained himself from pardoning either murders or highway robberies, and quickly discerned the fruits of his severity by a wonderful reformation of those enormities. He was very punctual and regular in his devotions; he was never known to enter upon his recreations or sports, though never so early in the morning, before he had been at public prayers; so that on hunting days his chaplains were bound to a very early attendance. He was likewise very strict in observing the hours of his private cabinet devotions; and was so severe an exactor of gravity and reverence in all mention of religion, that he could never endure any light or profane word, with what sharpness of wit soever it was covered; and though he was well pleased and delighted with reading verses made upon any occasion, no man durst bring before him any thing that was profane or unclean. That kind of wit had never any countenance then. He was so great an example of conjugal affection, that they who did not imitate him in that particular did not brag of their liberty; and he did not only permit, but direct his bishops to prosecute those scandalous vices, in the ecclesiastical courts, against persons of eminence, and near relation to his service.

His kingly virtues had some mixture and alloy, that hindered them from shining in full lustre, and from producing those fruits they should have been attended with. He was not in his nature very bountiful, though he gave very much. This appeared more after the Duke of Buckingham’s death, after which those showers fell very rarely; and he paused too long in giving, which made those, to whom he gave, less sensible of the benefit. He kept state to the full, which made his court very orderly; no man presuming to be seen in a place where he had no pretence to be. He saw and observed men long, before he received them about his person; and did not love strangers; nor very confident men. He was a patient hearer of causes; which he frequently accustomed himself to at the council board, and judged very well, and was dexterous in the mediating part; so that he often put an end to causes by persuasion, which the stubbornness of men’s humours made dilatory in courts of justice.

He was very fearless in his person; but not very enterprising. He had an excellent understanding, but was not confident enough of it; which made him oftentimes change his own opinion for a worse, and follow the advice of men that did not judge so well as himself. This made him more irresolute than the conjuncture of his affairs would admit; if he had been of a rougher and more imperious nature he would have found more respect and duty. And his not applying some severe cures to approaching evils proceeded from the lenity of his nature, and the tenderness of his conscience, which, in all cases of blood, made him choose the softer way, and not hearken to severe counsels, how reasonably soever urged. This only restrained him from pursuing his advantage in the first Scottish expedition, when, humanly speaking, he might have reduced that nation to the most slavish obedience that could have been wished. But no man can say he had then many who advised him to it, but the contrary, by a wonderful indisposition all his council had to fighting, or any other fatigue. He was always an immoderate lover of the Scottish nation, having not only been born there, but educated by that people, and besieged by them always, having few English about him till he was king; and the major number of his servants being still of that nation, who he thought could never fail him. And among these, no man had such an ascendant over him, by the humblest insinuations, as Duke Hamilton had.

As he excelled in all other virtues, so in temperance he was so strict, that he abhorred all debauchery to that degree, that, at a great festival solemnity, where he once was, when very many of the nobility of the English and Scots were entertained, being told by one who withdrew from thence, what vast draughts of wine they drank, and “that there was one earl, who had drank most of the rest down, and was not himself moved or altered,” the king said “that he deserved to be hanged”; and that earl coming shortly after into the room where his majesty was, in some gaiety, to show how unhurt he was from that battle, the king sent one to bid him withdraw from his majesty’s presence; nor did he in some days after appear before him.

So many miraculous circumstances contributed to his ruin, that men might well think that heaven and earth and the stars designed it. Though he was, from the first declension of his power, so much betrayed by his own servants, that there were very few who remained faithful to him; yet that treachery proceeded not from any treasonable purpose to do him any harm, but from particular and personal animosities against other men. And, afterwards, the terror all men were under of the parliament, and the guilt they were conscious of themselves, made them watch all opportunities to make themselves gracious to those who could do them good; and so they became spies upon their master, and from one piece of knavery were hardened and confirmed to undertake another; till at last they had no other hope of preservation but by the destruction of their master. And after all this, when a man might reasonably believe that less than a universal defection of three nations could not have reduced a great king to so ugly a fate, it is most certain that, in that very hour when he was thus wickedly murdered in the sight of the sun, he had as great a share in the hearts and affections of his subjects in general, was as much beloved, esteemed, and longed for by the people in general of the three nations, as any of his predecessors had ever been. To conclude, he was the worthiest gentleman, the best master, the best friend, the best husband, the best father, and the best Christian that the age in which he lived produced. And if he were not the best king, if he were without some parts and qualities which have made some kings great and happy, no other prince was ever unhappy who was possessed of half his virtues and endowments, and so much without any kind of vice.’

The character of Cromwell:

‘He was one of those men, quos vituperate ne inimici quidem possunt, nisi ut simul laudent;… for he could never have done half that mischief without great parts of Courage, Industry, and Judgement. He must have had a wonderful understanding in the natures and humours of men, and as great a dexterity in applying them; who, from a private and obscure birth (though of a good family) without interest or estate, alliance or friendship, could raise himself to such a height, and compound and knead such opposite and contradictory tempers, humours, and interests into a consistence, that contributed to his designs, and to their own destruction; whilst himself grew insensibly powerful enough to cut off those by whom he had climbed, in the instant that they projected to demolish their own building. What was said of Cinna may very justly be said of him, ausum eum, quae nemo auderet bonus: perfecisse, quae a nullo, nisi fortissitno perfici possunt.. . Without doubt, no man with more wickedness ever attempted any thing, or brought to pass what he desired more wickedly, more in the face and contempt of Religion, and moral Honesty; yet wickedness as great as his could never have accomplished those designs, without the assistance of a great spirit, an admirable circumspection, and sagacity, and a most magnanimous resolution.

When he appeared first in the parliament, he seemed to have a person in no degree gracious, no ornament of discourse, none of those talents which use to conciliate the affections of the stander by: yet as he grew into place and authority, his parts seemed to be raised, as if he had concealed faculties, till he had occasion to use them; and when he was to act the part of a great man, he did it without any indecency, notwithstanding the want of custom.

After he was confirmed and invested Protector by the humble Petition and Advice, he consulted with very few upon any action of importance, nor communicated any enterprise he resolved upon, with more than those who were to have principal parts in the execution of it; nor with them sooner than was absolutely necessary. What he once resolved, in which he was not rash, he would not be dissuaded from, nor endure any contradiction of his power and authority; but extorted obedience from them who were not willing to yield it.

[He] was not so far a Man of blood, as to follow Machiavel’s method; which prescribes upon a total alteration of Government, as a thing absolutely necessary, to cut off all the heads of those, and extirpate their families, who are friends to the old one. It was confidently reported that, in the Council of Officers, it was more than once proposed, ‘that there might be a general massacre of all the Royal Party, as the only expedient to secure the government’, but that Cromwell would never consent to it; it may be, out of too much contempt of his enemies. In a word, as he was guilty of many crimes against which damnation is denounced, and for which Hell-fire is prepared, so he had some good qualities which have caused the memory of some men in all ages to be celebrated; and he will be looked upon by posterity as a brave wicked man.’

Edward Hyde, Earl of Clarendon, History of the Rebellion and Civil Wars.