a short summary from Wikipedia:

William IV

King of the United Kingdom

Reign: 26 June 1830 – 20 June 1837

Coronation: 8 September 1831

Predecessor: George IV

Successor: Victoria

King of Hanover:

Reign: 26 June 1830 – 20 June 1837

Predecessor: George IV

Successor: Ernest Augustus I

Consort: Adelaide of Saxe-Meiningen

Issue:

Legitimate:

Princess Charlotte Augusta Louisa

Princess Elizabeth Georgiana Adelaide

Illegitimate:

George FitzClarence, Earl of Munster

Henry FitzClarence

Sophia Sidney, Baroness De L'Isle and Dudley

Lady Mary Fox

Lord Frederick FitzClarence

Elizabeth Hay, Countess of Erroll

Lord Adolphus FitzClarence

Lady Augusta Gordon

Lord Augustus FitzClarence

Amelia Cary, Viscountess Falkland

Full name:

William Henry

House: House of Hanover

Father: George III

Mother: Charlotte of Mecklenburg-Strelitz

Born: 21 August 1765

Buckingham House, London

Died: 20 June 1837 (aged 71)

Windsor Castle, Berkshire

Burial: 8 July 1837

St George's Chapel, Windsor

Occupation: Military (Naval)

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Wikipedia links:

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more links:

http://www.britroyals.com/kings.asp?id=william4

http://www.englishmonarchs.co.uk/hanover_5.htm

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=1984

http://www.geneall.net/U/per_page.php?id=5324

http://www.nndb.com/people/387/000093108/

http://www.royalgenes.com/royalty/I203.html

http://www.royalist.info/execute/biog?person=621

http://thepeerage.com/p10085.htm#i100850