Theobald I, Duke of Lorraine

Theobald I (c. 1191–1220), son of Frederick II and Agnes of Bar, ruled Lorraine from 1213. He stood by Emperor Otto IV and was captured at Bouvines in 1214, but soon released.

From 1216 he backed Erard of Brienne's claim to Champagne; Emperor Frederick II and the armies of Champagne, Burgundy and Bar invaded, burned Nancy and besieged him at Amance, where he surrendered by treaty in 1218 and gave up his support. He died in 1220 amid rumours of poison, and being childless was succeeded by his brother Matthias II.