He moved, therefore, in that world of Paris and Versailles (as did, later, his pupil, Mercy-d’Argenteau) rather as a native than a foreigner. Even if the alliance had been as artificial as it was natural, he would have carried his point. As it was, he left Paris in 1753 to assume the Prime Ministry at Vienna with the certitude that, when next Frederick of Prussia had occasion to break his word, the wealth and the arms of the Bourbons would be ranged upon the Austrian side.

Upon that major pivot all the schemes of Vienna must turn at his dictation. Every marriage must be contrived so as to fall in with the projected alliance; every action must be subordinated to the arrangement which would prove, as he trusted, the supreme hope of the dynasty. To this one project he directed every power within him or beneath his hand, and to this he was ready, when the time should come, to sacrifice the fortunes of any member of the Royal House save its sovereign or its heir. To this aspect of Europe, long before the termination of his mission in Paris, he had not so much persuaded as formed the mind of Maria Theresa.

The great and salutary soul of that woman explains in part what were to be the fortunes of her youngest child. Not that Marie Antoinette inherited either the opportunities or the full excellence of her mother, but that there ran through the impatient energy and unfruitful graciousness of the Queen of France a flavour of that which had lent a disciplined power and a conscious dignity to the middle age of Maria Theresa.

The body of the Empress was strong. Its strength enabled her to bear without fatigue the ceaseless work of her office, and in the midst of child-bearing to direct with exactitude the affairs of a troubled State. That strength of hers was evident in her equal temper, her rapid judgment, her fixed choice of men; it was evident also in her firm tread and in her carriage, and even as she sat upon a chair at evening she seemed to be governing from a throne.

A growing but uniform capacity informed her life. She had known the value not only of industry but also of enthusiasm, and had saved her throne in its greatest peril by her sudden and passionate appeal to the Hungarians. It was this instinctive science of hers that had disarmed Kaunitz. If he allowed her to suggest what he had already determined, if he permitted her to be the first to write down the scheme of the Diplomatic Revolution he had conceived, and to send it down to history as her creation rather than his own, it was not the desire to flatter her that moved him but a recognition of her due. She it was that sent him to Paris and she that superintended the weaving of the loom he had arranged.

Her dark and pleasing eyes, sparkling and strong, controlled him in so far as he was controlled by any outer influence, for he recognised in them the Cæsarian spirit.

Her largeness pleased him. When she played at cards, she played for fortunes; when she rode, she rode with magnificence; when she sang, her voice, though high, was loud, untrammelled, and full; when she drove abroad, it was with splendour and at a noble turn of speed.

All this was greatly to the humour of Kaunitz, and he continued to serve his Empress with a zeal he would never have given to a mere ambition. In deference to her, all that he could control of his idiosyncrasies he controlled. His great bull-dog, which followed him to every other door, was kept from her palace. His abrupt speech, his failure to reply, his sudden and brief commands—all his manner—were modified in consultation with his Queen. She, on her part, knew what were the limits to which so singular a nature could proceed in the matter of self-denial. She respected half his follies, and her servants often saw her from the courtyard shutting the windows, smiling, as he ran from his carriage, his mouth covered to screen it from the outer air. Her common sense and poise forgave in him alone extravagances she had little inclination to support in others. He respected in her those depths of emotion, of simplicity, and of faith which in others he would have regarded as imbecilities ready for his high intelligence to use at will.

It was neither incomprehensible to him nor displeasing that her temper should be warmer than his intelligence demanded. The increasing strength of her religion, the personal affections and personal distastes which she conceived, above all, the closeness of her devotion to her husband, completed, in the eyes of Kaunitz, a character whose dominions and dynasty he chose to serve and to confirm; for he perceived that what others imagined to be impediments to her policy were but the reflection of her sex and of her health therein.

Kaunitz saw in Frederick of Prussia a player of worthy skill. It was upon the death of that soldier that he gave vent to the one emotional display of his life; yet he permitted Maria Theresa to hate her rival with a hatred which was not directed against his campaigning so much as against the narrow intrigue and bitterness of his evil mind.