Guido Cavalcanti was an influential Italian poet of the late 13th century, known for his contributions to the development of the sonnet form within the Italian poetic tradition. He is recognized as one of the leading figures of the Dolce Stil Novo (Sweet New Style) movement, which emphasized themes of love and philosophical introspection. Cavalcanti's work significantly influenced later poets, including Dante Alighieri, highlighting the evolution of lyrical expression in poetry.