Antonie von Birkenstock Brentano (April 28, 1780, Vienna – April 12, 1869, Frankfurt am Main) is notable as one of the likelier candidates, of the many put forward by scholars, as composer Ludwig van Beethoven's Unsterbliche Geliebte, or "Immortal Beloved". Beethoven dedicated the Diabelli Variations Op. 120 to her, and his piano sonata Op. 90 to Maximiliane, her daughter. Her handwriting has been identified on a manuscript copy of the song cycle, An die ferne Geliebte ("To the Distant Beloved"), in which the following is written: "Requested by me from the author on March 2, 1812". On June 26, 1812 Beethoven wrote out an affectionate dedicatory message to her daughter on his piano trio in B flat (WoO 39).
Antonie, the daughter of Johann-Melchior von Birkenstock, was married in 1798 to the Frankfurt banker Franz Brentano, who was a good friend of Beethoven during the family's short stay in Vienna (the purpose of which was to tie up the Birkenstock estate after the death of Antonie's father). His half-sister was Bettina von Arnim née Brentano, who may have introduced Antonie to the composer in 1811.
Good morning, on July 7 Though still in bed, my thoughts go out to you, my Immortal Beloved, now and then joyfully, then sadly, waiting to learn whether or not fate will hear us - I can live only wholly with you or not at all - Yes, I am resolved to wander so long away from you until I can fly to your arms and say that I am really at home with you, and can send my soul enwrapped in you into the land of spirits - Yes, unhappily it must be so - You will be the more contained since you know my fidelity to you. No one else can ever possess my heart - never - never - Oh God, why must one be parted from one whom one so loves. And yet my life in V is now a wretched life - Your love makes me at once the happiest and the unhappiest of men - At my age I need a steady, quiet life - can that be so in our connection?.. (excerpt)
Upon Beethoven's death in 1827, the letter was found among his private papers, strongly suggesting either that it was never sent or that it was returned to him subsequently by the addressee. The currently fading academic favour for Antonie Brentano as the putative recipient may be attributed to the arguments adduced in an influential book by the Beethoven scholar, Maynard Solomon.
Solomon writes:
She must be a woman well known to Beethoven in Vienna; she must have been in Prague in the first week of July 1812; and she must have been in the Bohemian spa town of Karlsbad in the weeks following.
It should be borne in mind that Beethoven never refers to Karlsbad in the letter by name, instead using the initial "K", which one researcher has erroneously suggested might refer instead to Klosterneuburg, supposedly "the nearest post-stop to Countess Anna-Marie Erdödy's estate at Jedlersee". This hypothesis however is absolutely unfounded, because since Klosterneuburg could only be reached from Jedlesee via Vienna and Kahlenbergerdorf (there was no bridge across the Danube between Korneuburg and Klosterneuburg), the next post-stop to Jedlesee was of course the so-called "Hauptmaut" in Leopoldstadt in Vienna.
Thus Solomon sums up the three primary requirements for her identification, based on his own reading of evidence contained in the letter. But his reasoning is marred by a major flaw: the letters from the Brentano family that Klaus Martin Kopitz published in 2001, in a valiant effort to add some new documents to the debate, show that Antonie cannot have been the “Immortal Beloved.” She was a happily married wife and mother whose brief stay in Prague in July 1812 (less than one day) was spent in searching for an educator for her eleven-year-old son Georg: she had arrived with her husband, five-year-old daughter Fanny, and a maid on 3 July and they all left together for Karlsbad at 6 o’clock the next morning. Where did she have time that night for a tryst with Beethoven? As has been repeatedly argued, her candidacy, which includes the improbable scenario of a “ménage à trois” in Karlsbad, makes no psychological sense.
An additional (external) requirement suggested by Solomon is that the woman possibly is the "A" mentioned by Beethoven in Anton Gräffer's copy of Beethoven's Tagebuch (diary) entry of 1812:
"In the way with A., everything goes to ruin."
Since it is not even sure that Gräffer's transcription of the entry is correct, the letter "A" alone cannot provide basis for a reliable identification. In fact, Beethoven wrote the letter "A" in his found letters in the old German script, which is very different from the Latin form of "A", and the "A" may have been a musical notation. Recent research suggests that the "A" was actually a "St" that referred to Josephine von Stackelberg's husband Count Stackelberg.
Gail S. Altman puts forward a case for Anna-Marie — along with an exhaustive refutation of Solomon's claims for Antonie Brentano — in a study devoted to the question of the mysterious woman's identity and Beethoven's relationships in general, drawing particular attention to the composer's record of honourable conduct in all his dealings with married women. Altman goes on to underline that it would have been against Beethoven's deepest precepts to betray a friend (Franz Brentano) by carrying on an affair with his wife (Antonie) - as Solomon imputes.
In 2002, the Beethoven Journal, affiliated with the American Beethoven Society, published a paper contending that the Immortal Beloved was in fact Antonie's half-sister-in-law Bettina Brentano. See Beethoven Journal, Winter 2002, vol. 17, Issue 2. Bettina had published three letters she claimed to have received from Beethoven. One of them has been found, and is identical to what she published. In the found letter, Beethoven acknowledged already receiving from her two letters, and begged her to write to him again "soon and often". He said that he had carried one of her letters around with him all summer and that it made him "often supremely happy". In its closing words, he addressed her in the intimate German "du-form", which so far as is known, he never used in any letter to another woman except the Immortal Beloved. If the third letter from Beethoven that Bettina published, which has not been found, is genuine, it would conclusively prove that Bettina was his Immortal Beloved, because that third letter was written only a few weeks after he wrote his letter to the Immortal Beloved, and its language is completely consistent.