Which preposition to use with mongol

in Occurrences 5%

After shaking hands, he showed me a Mongol in the second-class car, and said to me, "That is not one of those we picked up at Douchak when we picked up Faruskiar and Ghangir.

from Occurrences 2%

She is the only great nation which has really expelled the Mongol from her country, and continued to protest against the presence of the Mongol in her continent.

for Occurrences 1%

As for me, I had soon forgotten all about the Mongol for the man in the case.

Which preposition to use with  mongol