So I'm new here, and relatively new to harmonic analysis. I was in the process of studying some old hymns, and ran across a chord I simply can't figure out. It has me stumped. The one that has me stumped is the first beat of the last measure in this selection (which I've uploaded as a pdf). The hymn is obviously in the key of Bb major,and all the other chords are easily identifiable, but what roman numeral should be given to a chord of Eb Bb G and C? Is the C just a non-chord tone? Any ideas? I feel kind of silly not knowing, since the answer is probably a simple one, but I guess the only way to learn is to ask.
Opennowthygates.pdf