Count Giacomo Taldegardo Francesco di Sales Saverio Pietro Leopardi (29 June 1798 – 14 June 1837) was an Italian philosopher, poet, essayist, and philologist. Considered the greatest Italian poet of the 19th century and one of the greatest authors of his time worldwide, as well as one of the principals of literary Romanticism, his constant reflection on existence and on the human condition—of sensuous and materialist inspiration—has also earned him a reputation as a deep philosopher. He is widely seen as one of the most radical and challenging thinkers of the 19th century, and one of the crowns of Italian Romanticism together with Alessandro Manzoni, even if he expressed different and sometimes opposing positions compared to the latter. Although he lived in a secluded town in the conservative Papal States, he came into contact with the main ideas of the Enlightenment, and, through his own literary evolution, created a remarkable and renowned poetic work, related to the Romantic era. The strongly lyrical quality of his poetry made him a central figure on the European and international literary and cultural landscape.

Leopardi was born into a local noble family in Recanati, in the Marche, at the time ruled by the papacy. His father, Count Monaldo Leopardi, who was fond of literature and a committed reactionary, remained an advocate of traditional ideals. His mother, Marchioness Adelaide Antici Mattei, was a cold and authoritarian woman, obsessed with rebuilding the family's financial fortunes, which had been destroyed by her husband's gambling addiction. A rigorous discipline of religion and economy reigned in the home. However, Giacomo's happy childhood, which he spent with his younger brother Carlo Orazio and his sister Paolina, left its mark on the poet, who recorded his experiences in the poem Le Ricordanze.

Following a family tradition, Leopardi began his studies under the tutelage of two priests, but his thirst for knowledge was quenched primarily in his father's rich library. Initially guided by Father Sebastiano Sanchini, Leopardi undertook vast and profound reading. These "mad and most desperate" studies included an extraordinary knowledge of classical and philological culture – he could fluently read and write Latin, ancient Greek and Hebrew – but he lacked an open and stimulating formal education.

Between the ages of twelve and nineteen, he studied constantly, driven also by a need to escape spiritually from the rigid environment of the paternal palazzo. His continual studies undermined an already fragile physical constitution, and his illness, probably Pott's disease or ankylosing spondylitis, denied him youth's simplest pleasures. He was 1.65 meters (5 ft 5 in) tall, but his health problems led him to stand only 1,41m (4 feet 8 inches) tall.

In 1817 the classicist Pietro Giordani arrived at the Leopardi estate. He became a lifelong friend of Giacomo, who derived from this a sense of hope for the future. Meanwhile, his life at Recanati weighed on him increasingly, to the point where he attempted to escape in 1818, but he was caught by his father and brought home. Thereafter relations between father and son continued to deteriorate, and Giacomo was constantly monitored by the rest of the family.

When in 1822 he was briefly able to stay in Rome with his uncle, he was deeply disappointed by its atmosphere of corruption and decadence and by the hypocrisy of the Church. He was impressed by the tomb of Torquato Tasso, to whom he felt bound by a common sense of unhappiness. While Foscolo lived tumultuously between adventures, amorous relations, and books, Leopardi was barely able to escape from his domestic oppression. To Leopardi, Rome seemed squalid and modest when compared to the idealized image that he had created of it. He had already suffered disillusionment in love at home, with his cousin Geltrude Cassi. Meanwhile, his physical ailments continued to worsen.

In 1824, a bookstore owner, Stella, called him to Milan, asking him to write several works, including Crestomazia della prosa e della poesia italiane. He moved during this period between Milan, Bologna, Florence and Pisa. In 1827 in Florence, Leopardi met Alessandro Manzoni, although they did not see things eye to eye. He paid a visit to Giordani and met the historian Pietro Colletta.

In 1828, physically infirm and worn out by work, Leopardi refused the offer of a professorship in Bonn or Berlin, made by the Ambassador of Prussia in Rome. In the same year, he had to abandon his work with Stella and return to Recanati. In 1830, Colletta offered him a chance to return to Florence, thanks to a financial contribution from the "Friends of Tuscany". The subsequent printing of the Canti allowed him to live away from Recanati until 1832. Leopardi found kindred company among the liberals and republicans seeking to liberate Italy from its yoke to Austria. Although his idiosyncratic and pessimistic ideas made him a party of one, he railed against Italy's "state of subjection" and was "in sympathy with the ideals of constitutionalism, republicanism and democracy, and supportive of movements urging Italians to fight for their independence."