Was the Israelite Kingdom Older Than Previously Thought?

It is generally agreed that, if Kings David and Solomon were historical personages, they would have lived in the 10th century BCE. But some scholars doubt that an organized kingdom existed in the land of Israel at the time, meaning that King David was either some sort of tribal chieftain or the mythical founder of a real dynasty. The recent discovery of clay seals (bullae) at Khirbet Summeily in the Negev suggests, however, that some sort of kingdom existed there much earlier than previously thought: