Which preposition to use with frederica

in Occurrences 2%

On the 8th of October, 1738, Oglethorpe set out from Frederica in an open boat, with two others attending it; and, after rowing two days and two nights, arrived at Savannah.

at Occurrences 1%

There was also a very pertinent and devout ascription of praise read, which he (and Mr. Jones is a good judge of edifying things,) pronounce to be very excellent; and, moreover, he maintained that it must have been prepared and composed by General Oglethorpe himself, for there was neither preacher nor school-master at Frederica at that time.

Which preposition to use with  frederica