Who among the following was not associated with Lake School of poetry?

The correct option is William Blake.

The "Lake School of poetry" (whose members are often referred to as the Lake Poets) was a group of English poets who lived in the picturesque Lake District of England at the beginning of the 19th century. They were a key part of the Romantic movement in English literature.

The three primary figures of the Lake School are:
• William Wordsworth, who settled in Grasmere in the Lake District.
• Samuel Taylor Coleridge, a close friend and collaborator of Wordsworth.
• Robert Southey, who also lived in the region and became the Poet Laureate.

In contrast, William Blake, while also a major Romantic poet and artist, lived and worked mostly in London and was not associated with the geographical region or the literary circle of the Lake School.