Rubuta ci gaba don wannan sakin layi - Mornay a hankali an gane shi a matsayin hannun dama na Henry, yana wakiltarsa a Ingila daga 1577 zuwa 1578 kuma a sake a 1580, kuma a cikin ƙasashe masu ƙasƙanci 1581-1582. Tare da mutuwar Duke na Alençon-Anjou a shekara ta 1584, wanda Henry ya kawo shi a gaban kursiyin Faransa, lokacin da Mornay ya fara aiki mafi girma na siyasa, kuma bayan mutuwar Henry I, Yarima na Condé, a shekara ta 1588, tasirinsa ya zama mai girma cewa an san shi da "Huguenot pope". Ya kasance a lokacin kewaye da Dieppe, ya yi yaƙi a Ivry
, kuma ya kasance a kewaye da Rouen a 1591-92 har sai da ya aika da wani manufa zuwa kotun Sarauniya Elizabeth. Dukansu shi da matarsa sun yi abokantaka da Furotesta na Ingila kamar Francis Walsingham, Mary Sidney, da ɗan'uwanta Philip Sydney.