In Grava v. Parkman Twp., 73 Ohio St.3d 379, 1995 Ohio 331, 653 N.E.2d 226, the court stated that the doctrine of res judicata bars not only subsequent actions involving the same legal theory of recovery as the previous action, but also claims which could have been litigated in the previous action: "It has long been the law of Ohio that 'an existing final judgment or decree between the parties to litigation is conclusive as to all claims which were or might have been litigated in a first lawsuit'" (emphasis sic) (quoting Rogers v. Whitehall 1986, 25 Ohio St.3d 67, 69, 25 OBR 89, 90, 494 N.E.2d 1387, 1388). The Court also declared that "the doctrine of res judicata requires a plaintiff to present every ground for relief in the first action, or be forever barred from asserting it." Id. Grava, at 382.