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Immediately behind the Propylaeum is a hexagonal forecourt[22] reached through a threefold entrance[24] that was added in the mid-3rd century by the emperor Philip the Arab.[citation needed] Traces remain of the two series of columns which once encircled it, but its original function remains uncertain.[22] Donne reckoned it as the town's forum.[4] Badly preserved coins of the era led some to believe this was a sacred cypress grove, but better specimens show that the coins displayed a single stalk of grain instead.[25]