Who were the Ivy League football kings in the 1910s?

Who were the Ivy League football kings in the 1910s?

1910-Pennsylvania (2-0)
1911-Princeton (3-0-1)

1912-Harvard (4-0)
1913-Harvard (5-0); Dartmouth (2-0)
1914-Cornell (2-0)
1915-Cornell (2-0)
1916-Brown (2-0)
1917-Pennsylvania (2-0)
1918-Pennsylvania (1-0)
1919-Navy (1-0)