Question: What king sent representatives to sign the treaty that is the reason Clark has often been hailed as the "Conqueror of the Old Northwest"?

Context paragraphs:
History of Michigan: The history of human activity in Michigan, a U.S. state in the Midwest, began with settlement of the western Great Lakes region by Native Americans perhaps as early as 11,000 BCE.  The first European to explore Michigan, Étienne Brûlé, came in about 1620.  The area was part of Canada (New France) from 1668 to 1763.  In 1701, the French officer Antoine de la Mothe Cadillac, along with fifty-one additional French-Canadians, founded a settlement called Fort Pontchartrain du Détroit, now the city of Detroit.  When New France was defeated in the French and Indian War, it ceded the region to Britain in 1763.  After the British defeat in the American Revolutionary War, the Treaty of Paris (1783) expanded the United States' boundaries to include nearly all land east of the Mississippi River and south of Canada.  Michigan was then part of the "Old Northwest".  From 1787 to 1800, it was part of the Northwest Territory.  In 1800, the Indiana Territory was created, and most of the current state Michigan lay within it, with only the easternmost parts of the state remaining in the Northwest Territory.  In 1802, when Ohio was admitted to the Union, the whole of Michigan was attached to the Territory of Indiana, and so remained until 1805, when the Territory of Michigan was established.

Lancashire Day: Lancashire Day is the county day of historic Lancashire in England.  It is held on 27 November to commemorate the day in 1295 when Lancashire first sent representatives to Parliament, to attend the Model Parliament of King Edward I.  Lancashire Day was first held in 1996.

Battle of Tripoli (1825): The Battle of Tripoli was a battle between the navies of the Kingdom of Sardinia and Vilayet of Tripoli on 26 September 1825 during the Sardinian-Tripolitanian war of the same year.  In order to resist Tripolitanian demands for increased tribute, the Sardinian king sent a squadron to force Tripoli to a favorable peace treaty.  The Tripolitanians refused to change their demands and as a result the Sardinian squadron assaulted the city of Tripoli, sinking several vessels and landing a force to attack the city.  Suffering heavy naval losses the Tripolitanian government quickly agreed to a favorable peace treaty with Sardinia, thus ending the war on favorable terms for the Sardinians.

Treaty of Paris (1783): The Treaty of Paris, signed in Paris by representatives of King George III of Great Britain and representatives of the United States of America on September 3, 1783, ended the American Revolutionary War.  The treaty set the boundaries between the British Empire in North America and the United States, on lines "exceedingly generous" to the latter.  Details included fishing rights and restoration of property and prisoners of war.

Fred Laycock: Frederick Walter Laycock (31 March 1897 – 19 September 1989) was an English professional footballer who played as an inside forward.  He was born in Sheffield.  He began his career in local football with St Mary's and Shirebrook.  After a spell in the Midland League with Rotherham Town, Laycock signed as a professional with Sheffield Wednesday in March 1923.  However, he failed to make a first-team appearance for the club and moved on a free transfer to Football League Third Division North side Barrow the following year.  At Holker Street, Laycock scored 10 goals in 31 league matches.  Said to be an outstanding header of the football, his form for Barrow attracted other clubs to his signature.  At the match against Rotherham County on 16 March 1925, the final day for transfers in the 1924–25 season, several clubs sent representatives to sign the player.  While the game was in progress, Laycock was called from the field of play to sign for Third Division North rivals Nelson, before completing the rest of the match for Barrow.  Both Laycock and Nelson were later fined over the incident, Laycock receiving his punishment for illegally representing Barrow while contracted to a different club.

1959 NCAA University Division Baseball Tournament: The 1959 NCAA University Division Baseball Tournament was played at the end of the 1959 NCAA University Division baseball season to determine the national champion of college baseball.  The tournament concluded with eight teams competing in the College World Series, a double-elimination tournament in its thirteenth year.  Eight regional districts sent representatives to the College World Series with preliminary rounds within each district serving to determine each representative.  These events would later become known as regionals.  Each district had its own format for selecting teams, resulting in 22 teams participating in the tournament at the conclusion of their regular season, and in some cases, after a conference tournament.  The College World Series was held in Omaha, NE from June 12 to June 18.  The thirteenth tournament's champion was Oklahoma State, coached by Toby Greene.  The Most Outstanding Player was Jim Dobson of Oklahoma State.

Thailand at the International Science Olympiad: Thailand first participated at the International Science Olympiad (ISO)—a group of academic competitions for secondary school students—since 1989, when it sent representatives to compete in the International Mathematical Olympiad in Germany.  Since then, it has expanded to send representatives to every branch of the annual competition.

Australia–New Zealand relations: Australia–New Zealand relations, also referred to as Trans-Tasman relations ("relations across the Tasman Sea"), are extremely close with both sharing British colonial heritage as Antipodean White Dominions and settler colonies as well as being part of the wider Anglosphere.  New Zealand sent representatives to the constitutional conventions which led to the uniting of the six Australian colonies but opted not to join; still, in the Boer War and in World War I and World War II, soldiers from New Zealand fought alongside Australians.  In recent years the Closer Economic Relations free trade agreement and its predecessors have inspired ever-converging economic integration.  The culture of Australia does differ from the culture of New Zealand and there are sometimes differences of opinion which some have declared as symptomatic of sibling rivalry.  This often centres upon sports such as rugby union or cricket or in commercial tensions such as those arising from the failure of Ansett Australia or those engendered by the formerly long-standing Australian ban on New Zealand apple imports.

Krasa Rossii: Krasa Rossii (Russian:"The Beauty of Russia") is a national beauty pageant in Russia that sends the country's representatives to the Miss Earth pageant.  The pageant also sent representatives at Miss Asia Pacific/International in the past.

George Rogers Clark: George Rogers Clark (November 19, 1752 – February 13, 1818) was a surveyor, soldier, and militia officer from Virginia who became the highest ranking American military officer on the northwestern frontier during the American Revolutionary War.  He served as leader of the militia in Kentucky (then part of Virginia) throughout much of the war.  Clark is best known for his celebrated captures of Kaskaskia (1778) and Vincennes (1779) during the Illinois Campaign, which greatly weakened British influence in the Northwest Territory.  Because the British ceded the entire Northwest Territory to the United States in the 1783 Treaty of Paris, Clark has often been hailed as the "Conqueror of the Old Northwest".

Supporting paragraphs: George Rogers Clark Treaty of Paris (1783)
Answer: King George III