Annette Vallon

In November 1791, Wordsworth visited Revolutionary France and became enthralled with the Republican movement. He fell in love with a French woman, Annette Vallon, who in 1792 gave birth to their child, Caroline. Because of lack of money and Britain's tensions with France, he returned alone to England the next year. The circumstances of his return and his subsequent behavior raise doubts as to his declared wish to marry Annette, but he supported her and his daughter as best he could in later life. The Reign of Terror estranged him from the Republican movement, and war between France and Britain prevented him from seeing Annette and Caroline again for several years. There are strong suggestions that Wordsworth may have been depressed and emotionally unsettled in the mid-1790s.

With the Peace of Amiens again allowing travel to France, in 1802 Wordsworth and his sister, Dorothy, visited Annette and Caroline in Calais. The purpose of the visit was to pave the way for his forthcoming marriage to Mary Hutchinson, and a mutually agreeable settlement was reached regarding Wordsworth's obligations. Afterwards he wrote the poem "It is a beauteous evening, calm and free," recalling his seaside walk with his daughter, whom he had not seen for ten years. At the conception of this poem, he had never seen his daughter before. The occurring lines reveal his deep love for both child and mother.

Source: http://en.wikipedia.org/wiki/William_Wordsworth