Reference for Ketubot 202:10

ועוד תני כנסה בידוע ונמצאת בידוע יש לה כתובה כנסה סתם אין לה כתובה תיובתא דרב הונא

Furthermore, it was explicitly taught: If he married her believing [that she was a widow] and it was found that his belief was justified, she is entitled to a ketubah, but if he married her with no presumption she is not entitled to a ketubah. This indeed is a refutation of R. Huna.

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