Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Odo I or Hodo I (also Huodo or Huoto; died 13 March 993) was the Margrave of the Saxon Ostmark from 965 until his death. Odo was, if the onomastics are correct, the son of Hidda and Christian of Thuringia. Odo held the county of Serimuntgau which Thietmar I of Meissen, a known son of Hidda, had held. He was buried in Nienburg, a monastic foundation of Thietmar''s. This too provides evidence of their probable relationship. In 965, Gero the Great, a likely uncle of Odo, died and his great march, the marca Geronis, was divided into five smaller marches. Odo received the so-called marca Orientalis or Eastern March. Odo was also later granted the countship of the gau of Nizizi. Odo first appeared with the title marchio (margrave) only in 974, though he had held marcher territories (officially as a county) since 965. In that same year (974), Odo was made Countof Nordthüringau.