What is Magna Carta? Clause 8 Introduction

In the 13th century, widows were often used as commodities in the marriage market, particularly during King John's reign. This practice was not new, as the rights of widows were mentioned in the Coronation Charter of Henry I. However, English barons were particularly angered by John's use of widows to promote foreign men at court, which was a greater concern than the rights of women.

What does the Coronation Charter of Henry the First mention regarding widows?

What was the underlying concern of the English barons regarding the promotion of foreign men at court?