A fourteen-line poem is a type of poem known as a SONNET. A SONNET is a poetic form that originated in Italy in the 13th century and consists of fourteen lines of iambic pentameter. The structure of a SONNET is usually divided into two parts, an octave (eight lines) and a sestet (six lines). The rhyme scheme of a SONNET is typically abbaabba cdecde or ababcdcdefefgg. Sonnets are often used to express love, longing, and other strong emotions.