Ralph Shaa
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Dr. Ralph Shaa (sometimes called John Shaa) (died 1484) was a 15th century British theologian, the half-brother of the Lord Mayor of London, Edmund Shaa. He played a minor but pivotal role in the War of the Roses by preaching a sermon in 1483 which claimed that Edward IV had already been betrothed to another woman at the time of his marriage to Elizabeth Woodville, and that Edward V was therefore illegitimate and had no claim to the throne.
He was the basis for the character of Shaw in Shakespeare's play Richard III.