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In page Robert Walpole:

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Walpole exercised a tremendous influence on the politics of his day. The Tories became a minor insignificant faction, and the Whigs became a dominant and largely unopposed party. His influence on the development of the uncodified constitution of Great Britain was less momentous, even though he is regarded as Great Britain's first prime minister.[1] He relied primarily on the favour of the King, rather than the support of the House of Commons. His power stemmed from his personal influence instead of the influence of his office. Most of his immediate successors were, comparatively speaking, extremely weak. It would take several decades more for the premiership to develop into the most powerful and most important office in the country.[citation needed]