Ralph Shaa sometimes called John Shaa, was a 15th century English theologian, the half-brother of the Lord Mayor of London

Lord Mayor of London

The Right Honourable Lord Mayor of London is the legal title for the Mayor of the City of London Corporation. The Lord Mayor of London is to be distinguished from the Mayor of London; the former is an officer only of the City of London, while the Mayor of London is the Mayor of Greater London and...

, Edmund Shaa

Edmund Shaa

Sir Edmund Shaa was a goldsmith, Sheriff of London in 1475 and Lord Mayor of London in 1482. Shaa lent money to Edward IV and, as mayor , was extensively involved in the coronation of Edward IV’s brother Richard III...

. Shaa played a minor but pivotal role in the Wars of the Roses

Wars of the Roses

The Wars of the Roses were a series of dynastic civil wars for the throne of England fought between supporters of two rival branches of the royal House of Plantagenet: the houses of Lancaster and York...

 by preaching a sermon

Sermon

A sermon is an oration by a prophet or member of the clergy. Sermons address a Biblical, theological, religious, or moral topic, usually expounding on a type of belief, law or behavior within both past and present contexts...

 in 1483 which claimed that Edward IV

Edward IV of England

Edward IV was King of England from 4 March 1461 until 3 October 1470, and again from 11 April 1471 until his death. He was the first Yorkist King of England...

 had already been betrothed to another woman at the time of his marriage to Elizabeth Woodville

Elizabeth Woodville

Elizabeth Woodville was Queen consort of England as the spouse of King Edward IV from 1464 until his death in 1483. Elizabeth was a key figure in the series of dynastic civil wars known as the Wars of the Roses. Her first husband, Sir John Grey of Groby was killed at the Second Battle of St Albans...

, and that Edward V

Edward V of England

Edward V was King of England from 9 April 1483 until his deposition two months later. His reign was dominated by the influence of his uncle Richard, Duke of Gloucester, who succeeded him as Richard III...

 was therefore illegitimate and had no claim to the throne.

Shaa appears as "Shaw" in Shakespeare's play Richard III

Richard III (play)

Richard III is a history play by William Shakespeare, believed to have been written in approximately 1591. It depicts the Machiavellian rise to power and subsequent short reign of Richard III of England. The play is grouped among the histories in the First Folio and is most often classified...

.