About 200 BC, the city of Estakhr, five kilometers north of Persepolis, was the seat of the local governors. From there, the foundations of the second great Persian Empire were laid, and there Estakhr acquired special importance as the center of priestly wisdom and orthodoxy. The Sasanian kings have covered the face of the rocks in this neighborhood, and in part even the Achaemenid ruins, with their sculptures and inscriptions. They must themselves have been built largely there, although never on the same scale of magnificence as their ancient predecessors. The Romans knew as little about Estakhr as the Greeks had known about Persepolis, despite the fact that the Sasanians maintained relations for four hundred years, friendly or hostile, with the empire.