Thus years passed away. Laura became the mother of a numerous family, and time and care made havoc of her youthful beauty. Meanwhile, the sonnets of Petrarch had spread her fame throughout France and Italy, and attracted many to the court of Avignon, who were surprised and disappointed at the sight of her whom they had believed to be the loveliest of mortals. In 1347, during the absence of the poet from Avignon, Laura fell a victim to the plague, just twenty-one years from the day that Petrarch first met her. Now all his love was deepened and consecrated, and the effusions of his poetic genius became more melancholy, more passionate, and more beautiful than ever. He declined the offices and honors that his countrymen offered him, and passed his life in retirement. He was found one morning by his attendants dead in his library, his head resting on a book. The celebrity of Petrarch at the present day depends chiefly on his lyrical poems, which served as models to all the distinguished poets of southern Europe. They are restricted to two forms: the sonnet, borrowed from the Sicilians, and the canzone, from the Provençals. The subject of almost all these poems is the same--the hopeless affection of the poet for the high-minded Laura. This love was a kind of religious and enthusiastic passion, such as mystics imagine they feel towards the Deity, or such as Plato believes to be the bond of union between elevated minds. There is no poet in any language more perfectly pure than Petrarch--more completely above all reproach of laxity or immorality. This merit, which is equally due to the poet and to his Laura, is the more remarkable, considering the models which he followed and the court at which Laura lived. The labor of Petrarch in polishing his poems did much towards perfecting the language, which through him became more elegant and more melodious. He introduced into the lyric poetry of Italy the pathos and the touching sweetness of Ovid and Tibullus, as well as the simplicity of Anacreon. Petrarch attached little value to his Italian poems; it was on his Latin works that he founded his hopes of renown. But his highest title to immortal fame is his prodigious labor to promote the study of ancient authors. Wherever he traveled, he sought with the utmost avidity for classic manuscripts, and it is difficult to estimate the effect produced by his enthusiasm. He corresponded with all the eminent literati of his day, and inspired them with his own tastes. Now for the first time there appeared a kind of literary republic in Europe united by the magic bond of Petrarch's influence, and he was better known and exercised a more extensive and powerful influence than many of the sovereigns of the day. He treated with various princes rather in the character of an arbitrator than an ambassador, and he not only directed the tastes of his own age, but he determined those of succeeding generations.