Since raj hasn't corrected himself yet, I'm making an assumption (perhaps incorrect) that he intended his question as he worded it, but I haven't come up with anything better than that St. Dunstan and William H. Prescott both were said to have formative moments in complete darkness:
On William H. Prescott:
His visit to the Azores, which was constantly broken by confinement to a darkened room, is chiefly noteworthy from the fact that he there began the mental discipline which enabled him to compose and retain in memory long passages for subsequent dictation;
On St. Dunstan, Archbishop of Canterbury:
His mother, Cynethryth, a woman of saintly life, was miraculously forewarned of the sanctity of the child within her. She was in the church of St. Mary on Candleday, when all the lights were suddenly extinguished. Then the candle held by Cynethryth was as suddenly relighted, and all present lit their candles at this miraculous flame, thus foreshadowing that the boy "would be the minister of eternal light" to the Church of England.
St. Dunstan is also the patron saint of blind people, of which William H. Prescott was one due to getting a piece of stale bread lodged in his eye.
The only other guess that I have is that William H. Prescott and one of the Archbishops of Canterbury from way back then both have the dubious distinction of being traced relatives of George W. Bush. I can confirm the William H. Prescott bit, and given that GWB is traceably related to Charles the II of England, I'm guessing stretching the family tree back to the religious elite of the previous millenium wouldn't be too hard to do.
Is any of this close? Or am I looking in the wrong place? I've tried all the random things I can think of: I don't think they had the same biographer, or were played by the same actor in historical depictions. They also didn't have any dates or names in common that I can find. Maybe I'm missing something still though. Dunstan seems to be the most famous of the archbishops of canterbury from that reign, but maybe I'm looking at the wrong one. No eurekas yet for me on this one.