Michel de Castelnau, Sieur de la Mauvissière was a French soldier and diplomat, ambassador to Queen Elizabeth. He wrote a memoir covering the period between 1559 and 1570.
Michel de Castelnau, by Jaspar Isaac
Portrait medal of Michel de Castelnau, Sieur de la Mauvissière, by Steven van Herwijck, 1565
Mary, Queen of Scots, wrote many letters to Castelnau
Francis Walsingham was able to monitor Castelnau's correspondence
Mary, Queen of Scots, also known as Mary Stuart or Mary I of Scotland, was Queen of Scotland from 14 December 1542 until her forced abdication in 1567.
Portrait of Mary at about 17 years old, c. 1558–1560
Both Mary and her father King James V were born at Linlithgow Palace in West Lothian, Scotland.
Gold coin of 1553: obverse, coat of arms of Scotland; reverse, royal monogram
Mary and Francis in Catherine de' Medici's book of hours, c. 1574. Bibliothèque nationale de France, Paris.