There is no historical castle known specifically as "Stone Keep Castle" in the historical record. The term appears to be a descriptive confusion rather than a proper name.
Stone Keep: A "keep" (or donjon) is the fortified central tower of a medieval castle. A "stone keep" specifically refers to a keep built of stone rather than timber (motte-and-bailey). This is an architectural type, not a specific castle's name. Hundreds of castles across Europe and the Middle East feature stone keeps—from the White Tower (Tower of London) to Château de Coucy to Krak des Chevaliers.
If you're researching a particular castle described as having a notable stone keep, please provide:
With additional details, I can identify the actual castle and discuss its historical changes—whether architectural modifications, ownership transitions, military adaptations, or preservation history.
Medieval castles evolved continuously: timber to stone, square to round towers, addition of concentric walls, adaptation for gunpowder artillery, conversion to palaces, or romantic ruin. Every castle has its own story of change—but "Stone Keep Castle" isn't one of them.