Who married Isabella of Rumigny?

Theobald II (French: Thiébaud or Thiébaut; 1263 – 13 May 1312) was the Duke of Lorraine from 1303 until his death in 1312. He was the son and successor of Frederick III and Margaret, daughter of King Theobald I of Navarre of the Royal House of Blois.

Gaucher V de Châtillon (c. 1249 in Châtillon-sur-Marne – 1329), Lord of Châtillon, Count of Porcien, was constable of Champagne in 1284 and then Constable of France (1302–1329) during the reigns of five different kings. He was also tutor to the future Louis X of France and his primary minister.