According to his work, "La Vita Nuova", when he was nine years old he met Beatrice Portinari, daughter of Folco Portinari, with whom he fell in love "at first sight", and apparently without even having spoken to her. He saw her frequently after age 18, often exchanging greetings in the street, but he never knew her well—he effectively set the example for the so-called "courtly love". Dante gave his imprint to the Stil Novo. Love for Beatrice (as in a different manner Petrarch would show for his Laura) would apparently be the reason for poetry and for living, together with political passions. In many of his poems, she appears such as semi-divine, watching over him constantly.