When did Paganini write his 24 Caprices for Solo Violin Dates?

Niccolò Paganini composed his 24 Caprices for Solo Violin between 1805 and 1817. They were published in 1820 as "24 Caprices, Op. 1." These works are considered some of the most technically challenging pieces in the violin repertoire and showcase Paganini's virtuosic style.