In the autumn of 1704 the Electress Sophia paid a long visit to her beloved daughter, and spent two months with her at Lützenburg. The King of Prussia had great respect for his mother-in-law; she agreed with him in his love of pageantry, and, like him, was a great stickler for points of etiquette. But she had a larger mind, and was not content with the mere show of sovereignty: she loved the substance--domination and power. The Queen of Prussia received her mother with every demonstration of joy, and the festivities of Lützenburg were set going in her honour. Leibniz and Beausobre were there, and many intellectual tournaments took place. The Princess Caroline was there too, whom Sophia observed with especial interest. Caroline was now in her twenty-first year, and had blossomed into lovely womanhood; her features were regular, she had abundant fair hair, large blue eyes, a tall and supple figure and a stately bearing. The fame of her beauty and high qualities had travelled through Europe. True she was dowerless, the orphan daughter of a petty prince of no importance, but her guardian was the King of Prussia, and she was known to be the adopted daughter of his Queen. Thus it came about that her hand was sought by some of the most powerful princes in Europe, notably by the Archduke Charles, titular King of Spain, and heir to the Emperor, whom he later succeeded. The idea of this marriage had long been in the air, but in 1704 it took definite shape, and the Elector Palatine, who was interested in the matter from political reasons, solicited Caroline’s hand for the Archduke. Negotiations were proceeding while the Electress Sophia was at Lützenburg. We find Leibniz writing from there:-- “Apparently the Electress remains here until November, and will stay as long as the Queen is here. Two young princesses, the hereditary Princess of Cassel and the Princess of Ansbach, are also here, and I heard them sing the other night, a little _divertimento musicale_, the latter taking the part of ‘Night,’ the former that of ‘Aurora,’ the equinox adjusting the difference. The Princess of Cassel sings very tunefully; the Princess of Ansbach has a wonderful voice. Every one predicts the Spanish crown for her, but she deserves something surer than that crown is at present, though it may become more important; besides, the King of Spain (the Archduke) is an amiable prince.”[3]