- Source: Gerlach III of Isenburg-Covern
- Gerlach III of Isenburg-Covern
- Gerlach II of Isenburg-Covern
- Gerlach
- Henry of Isenburg-Covern
- County of Isenburg
- Isenburg-Grenzau
- List of state leaders in the 14th-century Holy Roman Empire
- List of state leaders in the 13th-century Holy Roman Empire
- List of state leaders in the 12th-century Holy Roman Empire
- List of longest-reigning monarchs
Gerlach III of Isenburg-Covern was the Count of Isenburg-Covern from 1217 until 1235.