Which preposition to use with masterships

of Occurrences 32%

When Parr was a candidate for the mastership of Colchester Grammar School, Johnson wrote for him a letter of recommendation.

in Occurrences 6%

He resigned his Upper Grammar Mastership in 1799, and probably retired to the rectory of Gainscolne to which he had been appointed by the school committee six years earlier.

at Occurrences 1%

Twenty-five years before he had rowed as number seven in the Oxford Eight, with an eye all the while upon a mastership at his old school.

over Occurrences 1%

The Czar of Russia was well aware, that this system of compromise prevents his intruding into the domestic concerns of Europe, which would lead him to the sovereign mastership over all; he therefore did everything to push the sovereigns to extremities.

Which preposition to use with  masterships