The city fathers, on learning that the Congress was to be convened in Vienna, commissioned Beethoven to write a cantata of welcome to honor the visitors. The poem "Der glorreiche Augenblick" (The Glorious Moment), was chosen, which Beethoven set to music. As may be supposed the new cantata served to increase his fame, although as a work of art it is about on a par with the Battle Symphony.

Beethoven occupied a prominent part in the many notable gatherings which were a feature of this winter. Associated in people's minds as a harbinger of the new era, his popularity increased in line with the ever brightening political horizon. The Archduke enjoyed having him at his receptions, introducing him to the sovereigns, and made much of him generally. It was at the Archduke's apartments that Beethoven was introduced to the Empress of Russia, who showed him much attention, both here and when meeting him elsewhere. He met her frequently at Count Rasoumowsky's, who as Russian Ambassador entertained lavishly in honor of his distinguished guests. He afterward related humorously how the crowned heads paid court to him, referring to the urbanity and courtesy which the Empress in particular, used toward him. Beethoven is on record as saying that he liked being with the aristocracy. He seems to have had no difficulty in impressing on the Empress the right concept of his importance as man and artist. In acknowledgment of the courtesies which he received from her, the master composed for her a Grand Polonaise (in C, opus 89) which, in company with the pianoforte arrangement of the Seventh Symphony he dedicated to her.

Shortly after the assembling of the Congress Beethoven gave a concert for his own benefit, at which the new Cantata as well as the Battle Symphony and the Seventh Symphony were performed. The Riding Hall, an immense structure, capable of seating six thousand persons was placed at his disposal, for which, however, a large price, one-half the receipts, was exacted, so Frimmel states. With sublime confidence Beethoven sent out invitations in his own name to the visiting sovereigns and other notabilities, all of whom responded, with the result that the hall was crowded and the concert proved to be a great success.

As a result of the winter's activities, Beethoven's finances were greatly improved. He displayed a degree of business ability during this year, which was not to have been expected from a man of his temperament. His profits from one source or another were such that he invested money to the extent of ten thousand florins, in shares of the Bank of Austria. It was his first and only investment, undertaken as a provision for the future.

That Beethoven kept his head in the face of all this adulation is evident from a letter written at this time to a friend at Prague in which he says, "I write nothing about our monarchs and monarchies. The intellectual realm is the most precious in my eyes, and far above all temporal and spiritual kingdoms."

It was indeed a brilliant winter, but all this joy was suddenly changed to something akin to terror by the news of Napoleon's escape from Elba in March of 1815, and that he was assembling his forces for another campaign. The gayeties had to be discontinued, the members of the Congress confined themselves to the work for which it was convened, the result being that the treaties were signed by the eight powers on June 7, upon which the Congress disbanded. This was just eleven days before the battle of Waterloo.

In November of this year Beethoven's brother Karl died, leaving the composer as an heritage his son Karl, then nine years of age. With the clairvoyance which approaching dissolution often brings, the father saw that the uncle would be a much better guardian for the boy, than the mother, and consigned him to Beethoven's care almost with his last breath. It was characteristic of such a man as was Beethoven, to accept the charge without hesitation, from an exaggerated sense of duty; to fight for its possession even, although it revolutionized his life and brought him face to face with all sorts of difficult and untried conditions.

As might have been expected, Karl's widow, who was the daughter of a rich citizen, contested his right to the control of the boy, and began legal proceedings to obtain possession of him. This was the advance-guard of a series of troubles that began to close in on him at this period, ending only with his life. Years of litigation followed, the issue being at times in favor of one side, then of the other, the boy meanwhile being in charge of the successful party. The new responsibility, assumed with scarcely a thought as to consequences, not only interfered with the bachelor habits of a lifetime, but the mental disturbance occasioned by the lawsuits which ensued, seriously interrupted his work, so that for some years very little was accomplished in the way of new compositions. "The higher a man is," said Goethe (Conversations with Eckermann), "the more he is under the influence of dæmons, and he must take heed lest his guiding will counsel him to a wrong path." Could he have foreseen how this adoption of the child would interfere with his cherished work, he might have paused to consider the matter, before binding himself irrevocably by his promise to his brother.

With never a fixed habitation, no sense of the value of money, giving it away to those in need as readily as if it had no value, often enduring privation himself in consequence; with a mode of life so simple that the entire ménage was frequently transported elsewhere on slight provocation, this ascetic was now to encounter housekeeping problems, make money, save it (most difficult of all), employ servants, in short undertake in middle-age and in impaired health, duties the nature of which he could not even form an estimate.

The plan of adopting the boy might not have been such a visionary one, could Beethoven have been in entire control from the start. While the litigation went on, discipline was out of the question. There were occasional victories for the mother, who then had the boy under her absolute control until such time as Beethoven was able to get the decision of the Court reversed. Even when the boy was under the uncle's charge, the mother managed at times to gain access to him in order to poison his mind against the uncle. Her influence whenever she was able to exert it was naturally adverse. That there should be a stronger affinity between mother and son, than between uncle and nephew is not surprising. She had had entire control of him up to his tenth year. She was lax in discipline and saw to it that the boy had a better time while with her than he was likely to have when under his uncle's care. That the boy began to show a preference for being with the mother can be easily understood, and it was a bitter trial to the master.