Theodoric I (Full Name Theodoric I von Wettin) (10th century; German: Dietrich, also known as Thierry) was a nobleman in the Duchy of Saxony, and the oldest traceable member of the House of Wettin.
[1] Theodoric was born in the early 10th century to unknown parents.
Dedo is the first known count of Wettin, and Dedo's son, Theodoric II, Margrave of Lower Lusatia, is considered as the first member of the Wettin dynasty, taken as established by his father.
Theodoric had two sons: Thietmar names Theodoric as a member of the tribe of the Buzici (de tribu, quae Buzici dicitur) and as a relative on his father's side of Rikdag, Margrave of Meissen (r. 979–985).
Theodoric's wife is named as one Jutta or Judith of Merseburg in early modern historiography.