The Turgowe pagus within Alamannia was named for the Thur, and it included the entire Alamannic territory between Upper Rhine and Reuss.
After the Council of Cannstatt, a Frankish nobleman named Warin is recorded as count in Thurgau for the year 754.
Hunfriding counts of Thurgau in the 9th to 10th centuries include Adalbert II (854, 894), Udalrich (912, 917) and Burchard III (920).
The most important cities of Thurgovia in the early medieval period were Constance as the seat of the bishop, and St. Gallen for its abbey.
In 1524, in an incident that resonated across Switzerland, local peasants occupied the Charterhouse of Ittingen in the Thurgau, driving out the monks, destroying documents, and devastating the wine-cellar.