Stephen I of Sancerre Count of Sancerre from 1151 to 1190 (1200–1190) Parents Matilda of Carinthia Theobald II of Champagne Children Stephen II de Sancerre William I Siblings Theobald V, Count of Blois Guillaume aux Blanches Mains Agnes of Blois Adèle of Champagne Henry I, Count of Champagne Matilda of Champagne Marie of Champagne Isabelle de Champagne Margaret de Champagne Partners Ermesinde de Donzy