[1] La Fontaine also maintained a correspondence with protestant leaders throughout Europe, such as Theodore Beza in Geneva and Philippe Du Plessis Mornay in France.
[2] During Henry IV's wars against the Catholic League and Spain in the 1590s, Du Plessis arranged to have La Fontaine appointed the French king's unofficial representative in England.
He was in direct communication with both monarchs, and maintained a wide correspondence with influential royal councillors, such as Villeroy in France and Burghley and Robert Cecil in England, and with nobles such as the duc de Bouillon and the earl of Essex.
[3] By this time La Fontaine was sixty one,[4] and after Henry's peace with Spain in 1598 he withdrew himself from active diplomacy, but throughout the following years he continued to maintain contact with Du Plessis and remained an important link between the Huguenots in France and the English church and government.
His son, Louis, a king's councillor who had assisted his father in his diplomatic activities, maintained the family name in France, as the sieur de la Fontaine et d'Ancreville.
[9] Fontaine had business connections with a Scottish merchant George Bruce of Carnock, and in July 1588 undertook to repay a loan of £100 Stirling made to the English ambassador in Edinburgh, William Ashby.