In 1748 Gluck settled in Vienna, where almost immediately his opera of "Semiramide" was produced. Here he conceived a passion for Marianne, the daughter of Joseph Pergin, a rich banker; but on account of the father's distaste for a musical son-in-law, the marriage did not occur till 1750. "Telemacco" and "Clemenza di Tito" were composed about this time, and performed in Vienna, Rome, and Naples. In 1755 our composer received the order of the Golden Spur from the Roman pontiff in recognition of the merits of two operas performed at Rome, called "Il Trionfo di Camillo" and "Antigono." Seven years were now actively employed in producing operas for Vienna and Italian cities, which, without possessing great value, show the change which had begun to take place in this composer's theories of dramatic music. In Paris he had been struck with the operas of Rameau, in which the declamatory form was strongly marked. His early Italian training had fixed in his mind the importance of pure melody. From Germany he obtained his appreciation of harmony, and had made a deep study of the uses of the orchestra. So we see this great reformer struggling on with many faltering steps towards that result which he afterwards summed up in the following concise description--"My purpose was to restrict music to its true office, that of ministering to the expression of poetry, without interrupting the action." In Calzabigi Gluck had met an author who fully appreciated his ideas, and had the talent of writing a libretto in accordance with them. This coadjutor wrote all the librettos that belonged to Gluck's greatest period. He had produced his "Orpheus and Eurydice" and "Alceste" in Vienna with a fair amount of success; but his tastes drew him strongly to the French stage, where the art of acting and declamation was cultivated then, as it is now, to a height unknown in other parts of Europe. So we find him gladly accepting an offer from the managers of the French Opera to migrate to the great city, in which were fermenting with much noisy fervour those new ideas in art, literature, politics, and society, which were turning the eyes of all Europe to the French capital.