Question: Queen Street, Fremantle is named after the consort of William IV of the United Kingdom, who was King beginning what year?

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Elizabeth Hay, Countess of Erroll: Elizabeth Hay, Countess of Erroll (17 January 1801 – 16 January 1856; born Elizabeth FitzClarence) was an illegitimate daughter of King William IV of the United Kingdom and Dorothea Jordan.  She married William Hay, 18th Earl of Erroll, and became Countess of Erroll on 4 December 1820 at age 19.  Due to Hay's parentage, William Hay became Lord Steward of the Household.  Elizabeth and William Hay married at St George's, Hanover Square.  Hay is pictured in a FitzClarence family portrait in House of Dun and kept a stone thrown at her father William IV and the gloves he wore on opening his first Parliament as mementos.  She died in Edinburgh, Scotland.

Alexandra Park, Toronto: Alexandra Park is a neighbourhood located in downtown Toronto, Ontario, Canada.  Alexandra Park is bounded by Dundas Street West on the north, Spadina Avenue on the east, Queen Street West on the south, and Bathurst Street on the west.  Alexandra Park consists of private and public housing, with at grade retail along Queen Street West and Spadina Avenue, some institutional, and several commercial buildings scattered through the neighborhood.  The neighborhood takes its name from Alexandra Park, a municipal park at the south-east corner of Dundas Street West and Bathurst Street.  The park is named for Queen Alexandra, wife of King Edward VII, the first future monarch to visit Toronto.

Regency Act 1830: The Regency Act 1830 (1 Will.4 c.2) was an Act of the Parliament of the United Kingdom passed to cater for the event that King William IV died while the next person in line to the throne was not yet aged 18.  It provided for a regency until the new monarch reached the age of 18, and also would have enabled a posthumous child of King William IV to replace Queen Victoria on the throne.  However, the Act never came into force, because William was not survived by a legitimate child and Victoria became queen at the age of 18 in 1837.

Adelaide Peninsula: Adelaide Peninsula ("Iluilik"), ancestral home to the "Illuilirmiut" Inuit, is a large peninsula in Nunavut, Canada.  It is located at south of King William Island.  Its namesake is Queen Adelaide, consort of King William IV of the United Kingdom.

Regency era: The Regency in Great Britain was a period when King George III was deemed unfit to rule and his son ruled as his proxy as Prince Regent.  On the death of George III in 1820, the Prince Regent became George IV.  The term Regency (or Regency era) can refer to various stretches of time; some are longer than the decade of the formal Regency which lasted from 1811–1820.  The period from 1795 to 1837, which includes the latter part of the reign of George III and the reigns of his sons George IV and William IV, is often regarded as the Regency era, characterised by distinctive trends in British architecture, literature, fashions, politics, and culture.  The Regency era ended in 1837 when Queen Victoria succeeded William IV.

King William Street (Hamilton, Ontario): King William Street is a Lower City collector road in Hamilton, Ontario, Canada.  It starts off at the western-end at James Street North and is a one-way street (Eastbound) until Mary Street, where it becomes a two-way street that ends at Wentworth Street North.  It is named after King William IV of the United Kingdom.

Queen Street, Fremantle: Queen Street, Fremantle is a street that crosses High Street, Fremantle at Kings Square, in Fremantle, Western Australia, and is located away from and west of Queens Square.  It is a separate Fremantle street from Queen Victoria Street, Fremantle, which is located 500 m further north.  The street is named after Queen Adelaide, consort of William IV.

Old Town, Toronto: Old Town is a neighbourhood and retail district in downtown Toronto, Ontario, Canada.  It was the first of Toronto's named neighbourhoods, having acquired the moniker no later than 1815, at which time the original town of York was expanding.  The old neighbourhood was referred to as "Old Town" by residents, and the new neighbourhood as "New Town".  The site still has a large number of 19th-century buildings.  The neighbourhood's approximate boundaries are Queen Street on the north from Church Street east to Parliament Street, Parliament Street south to Front Street, Front Street west to Jarvis Street, one block north to King Street and Church Street north to Queen Street.

Adelaide of Saxe-Meiningen: Adelaide of Saxe-Meiningen (Adelaide Louise Theresa Caroline Amelia; German: "Adelheid" ; 13 August 1792 – 2 December 1849) was the queen consort of the United Kingdom and of Hanover as spouse of William IV of the United Kingdom.  Adelaide was the daughter of George I, Duke of Saxe-Meiningen, and Luise Eleonore of Hohenlohe-Langenburg.

William IV of the United Kingdom: William IV (William Henry; 21 August 1765 – 20 June 1837) was King of the United Kingdom of Great Britain and Ireland and King of Hanover from 26 June 1830 until his death.  The third son of George III and younger brother and successor to George IV, he was the last king and penultimate monarch of Britain's House of Hanover.

Supporting paragraphs: Queen Street, Fremantle William IV of the United Kingdom
Answer: 1830