Governors of North Greenland
Governors of South Greenland
Governor of East Greenland (annexed by Norway in 1932 and named Eric the Red's Land[?].)
Governors of Greenland
For leaders after this see: List of Prime Ministers of Greenland
... of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...