Theobald I of Blois

Theobald I, called the Trickster, was the son of Theobald the Elder and founder of the comital House of Blois. Around 940 he became count of Blois, Tours and Chartres, chief lieutenant of Hugh the Great, and about 944 married Luitgarde of Vermandois.

In 945 he held the captured King Louis IV in his custody. After Hugh's death in 956, Theobald exercised a near regency during the minority of Hugh Capet. From 960 he warred on the Normans until they burned Chartres and killed his eldest son in 962.

After Hugh Capet disapproved of the war, Theobald sought the support of King Lothair, and by his death around 977 ruled a vast Loire principality.