You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Anthony Charles FitzClarence was the last of the senior male line that began with the third son of George III and younger brother and successor to who?" whose answer is George IV.
Each document should contain about 30 words, and these documents should contain useful information.

Query: George IV successor
Useful Output:

Doc 1: He was succeeded by his younger brother William IV of Great Britain (r. 1830-1837). The House of Hanover. The royal house of Hanover had taken
Doc 2: When his father Prince Frederick died unexpectedly in 1751 at age 44, George became heir apparent. In 1760, George III became monarch when his
Doc 3: George IV, King of the United Kingdom (1762-1830) · King Edward VII, King of the United Kingdom (1841-1910) · Queen Alexandra of the United Kingdom (1844-1925).
Doc 4: Successor, William IV · Prince Regent of the United Kingdom. Regency, 5 February  George III, William, Duke of Clarence, who reigned as William IV.
Doc 5: George IV was 48 when he became Regent in 1811, as a result of the illness of his father, George III. He succeeded to the throne in January 1820.