Sonnet 126 is one of 154 sonnets written by the English playwright and poet William Shakespeare

William Shakespeare

William Shakespeare was an English poet and playwright, widely regarded as the greatest writer in the English language and the world's pre-eminent dramatist. He is often called England's national poet and the "Bard of Avon"...

. It's the final member of the Fair Youth sequence, in which the poet shows how Time and nature coincide.
This sonnet has 12 lines, although it is possible that the other two lines have been lost. Sonnet 99

Sonnet 99

Sonnet 99 is one of 154 sonnets written by the English playwright and poet William Shakespeare. It is a member of the Fair Youth sequence, in which the poet expresses his love towards a young man...

is the only other sonnet that does not have 14 lines (it has 15).