Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Name | Term start | Term end | Date of Birth | Date of Death |
| --- | --- | --- | --- | --- |
| George Brown | 1867.0 | 1867 | November 29, 1818 | May 9, 1880 |
| Edward Blake | 1869.0 | 1870 | October 13, 1833 | March 1, 1912 |
| Alexander Mackenzie | 1873.0 | 1880 | January 28, 1822 | April 17, 1892 |
| Edward Blake | 1880.0 | 1887 | October 13, 1833 | March 1, 1912 |
| Wilfrid Laurier | 1887.0 | 1919 | November 20, 1841 | February 17, 1919 |
| Daniel Duncan McKenzie | 1919.0 | 1919 | January 8, 1859 | June 8, 1927 |
| William Lyon Mackenzie King | 1919.0 | 1948 | December 17, 1874 | July 22, 1950 |
| Louis St. Laurent | 1948.0 | 1958 | February 1, 1882 | July 25, 1973 |
| Lester B. Pearson | 1958.0 | 1968 | April 23, 1897 | December 27, 1972 |
| Pierre Trudeau | 1968.0 | 1984 | October 18, 1919 | September 28, 2000 |
| John Turner | 1984.0 | 1990 | June 7, 1929 | living |
| Jean Chrétien | 1990.0 | 2003 | January 11, 1934 | living |
| Paul Martin | 2003.0 | 2006 | August 28, 1938 | living |
| Bill Graham | 2006.0 | 2006 | March 17, 1939 | living |
| Stéphane Dion | 2006.0 | 2008 | September 28, 1955 | living |
| Michael Ignatieff | 2008.0 | 2011 | May 12, 1947 | living |
| Bob Rae | 2011.0 | 2013 | August 2, 1948 | living |
| Justin Trudeau | 2013.0 | Incumbent | December 25, 1971 | living |
Question:
Which leader born on December 17, 1874 started their term before 1984?
Answer:
William Lyon Mackenzie King