Johann was the son of unknown parents. The date and place of his birth have not been found.
His wife was Luitgard von Henneberg, who he married in 1229. The place has not been found. They had no known children.
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | 1230 | herr von Rostock | ||||
| Nobility Title | 1232 | fürst von Mecklenburg |
Note 1
fils de Heinrich Borwin II et Christine de Suède