N.T.o. 1. To inquire into: 2. to find out by inquiring: 3. to gain knowledge by visiting; to become personally acquainted with. In lxx, only 1 Esd. 1:33, 42, to relate, to record. Often in Class. The word here indicates that Paul went, not to obtain instruction, but to form acquaintance with Peter.
Cephas
See on Mat 16:18; see on Joh 1:42; see on 1Co 1:12.