Which preposition to use with groome

of Occurrences 2%

Peskerolen, Groome of the chamber.

in Occurrences 1%

In 1848, Mr. Ewing commenced the study of the law in the office of the late John C. Groome in Elkton, and was admitted to the Elkton Bar, April 10, 1851.

Which preposition to use with  groome