Diego Guzmán de Silva
Diego Guzmán de Silva (Ciudad Rodrigo, c. 1520 - Venice, 1577) was a Spanish canon and diplomat. He served as ambassador to England (then under Elizabeth I), the Republic of Genoa and the Republic of Venice.
Guzman saw that Elizabeth I wore a miniature portrait of Mary, Queen of Scots, on a chain at her waist in April 1566. He wrote a number of letters describing the arrival of Mary, Queen of Scots, in England in May 1568, and the efforts of French and Scottish diplomats on her behalf.