His Eminence
This phrase originally referred to François Leclerc du Tremblay, the right-hand man of Cardinal Richelieu. Leclerc was a Capuchin friar who was renowned for his beige robe attire, as beige was termed "grey" in that era. The style "His Eminence" is used to address or refer to a cardinal in the Roman Catholic Church. Although Leclerc never achieved the rank of cardinal, those around him addressed him as such in deference to the considerable influence this "grey" friar held over "His Eminence the Cardinal". As a result, the term grey cardinal has also been used.