A sonnet sequence is a group of sonnets written to be read together because they share a speaker, theme, story, or emotional arc. The individual poems often stand alone, but the sequence creates a larger meaning through the order of the sonnets and the way they develop an idea over time.
Writers use sonnet sequences to trace love, loss, devotion, conflict, or change across many related poems rather than in a single sonnet.
Example
First I praised the spring and called it mine,
Then watched the rose lose color in the rain;
By sonnet three, the brightened road grew thin,
And every return led back to the same refrain.