Some time previously to the date of this last-recorded incident, Mademoiselle Sontag had twice changed her name. The old King of Prussia, informed of her projected marriage with a Sardinian nobleman and diplomatist, to whose sovereign it was possible that her humble birth might be objectionable, ennobled her under the name and title of Mademoiselle de Launstein, which she soon afterwards abandoned for that of Countess de Rossi. Her first visit to England was subsequent to her marriage, then kept private, although pretty generally known. She first sang in this country at a concert at Devonshire House, her passage to which was through a throng of gazers, drawn together by her reputation for grace, beauty, and musical genius. A few days afterwards, on Tuesday the 15th April 1828, occurred her appearance at the London Opera, in the character of Rosina, in the _Barbiere di Seviglia_. For two seasons she sang in London; then in Berlin and St Petersburg; and then, the King of Sardinia having authorised her husband to declare his marriage, she left the stage--for ever, as she doubtless thought. But in days when kings are discarded, constitutions annulled, and empires turned upside down at a few hours' notice, who shall presume to foretell his fate? For eighteen years Madame de Rossi adorned the various courts to which her husband was successively accredited as ambassador. The Hague, Frankfort, St Petersburg, Berlin, each in turn welcomed and cherished her. Then came the storm: her fortune was swallowed up; her husband's diplomatic prospects were injured; she thought of her children, and sacrificed herself--if sacrifice it is to be called, by which, whilst fulfilling what she feels to be her duty to her family, she may reckon on speedily retrieving the pecuniary losses consequent on German and Sardinian revolutions.