Final answer:
Elizabeth Barrett Browning is the poet who wrote 'Sonnet 43', which is part of her collection 'Sonnets from the Portuguese'. It is a Petrarchan sonnet, expressing her love for Robert Browning and is known for its opening line about the ways of love.
Step-by-step explanation:
The poet who wrote Sonnet 43 is Elizabeth Barrett Browning. This sonnet is one of the most famous from her collection Sonnets from the Portuguese, which was written during 1845-1846 and published in 1850. Elizabeth Barrett Browning's Sonnet 43 starts with the famous line, "How do I love thee? Let me count the ways."
Sonnet 43 is a part of a sequence of poems that Elizabeth Barrett Browning penned, expressing her intense love for her future husband, Robert Browning. Unlike the Shakespearean sonnets with their distinct rhyme scheme and structure, Browning's sonnet follows a Petrarchan sonnet form. She takes advantage of the sonnet's strict form to express the depth and breadth of her love in a very personal and intense manner.