Eustace I Granier, also known as Eustace Grenier or Eustace Garnier, called in Latin Eustachius Granarius in the charters, was a Flemish crusader who took part in the First Crusade. He became lord of Caesarea in 1101, lord of Sidon in 1110, and in April 1123, was elected constable and bailiff of Jerusalem during the captivity of Baldwin II of Jerusalem. Shortly before his death, he defeated a Fatimid army at the Battle of Yibneh near Ibelin.
- Occupation
- feudatory, ruler
- Position held
- constable of kingdom of Jerusalem, Bailiff of the kingdom of Jerusalem
- Citizenship
- Kingdom of Jerusalem
- Born
- 1001
