Which famous poet served as an official brand ambassador for Cadbury's cocoa in the late 19th century, appearing in advertisements that used his image and poetry excerpts?

The worlds of literature and brand marketing have intersected in fascinating ways throughout history. Many renowned authors have lent their names, voices, or images to promote products - sometimes with surprising partnerships that shaped both literary and advertising landscapes. This trivia explores the sometimes unexpected relationships between famous literary figures and the brands they represented.

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William Wordsworth
William Butler Yeats
William McGonagall
Walt Whitman