This monumental ewer is beautifully decorated with a precisely moulded pattern consisting of a continuous row of upright palmette trees, alternating with smaller trees terminating in a palmette blossom that hang upside-down, thus filling the interstices. The brilliant turquoise glaze, though thick enough to run down the footring, is so evenly applied that no detail of the intricate pattern is lost. Like vessels in the form of boats, bulls, horns or birds, cockerel-headed ewers were used in ancient Iran as ritual vessels. Numerous references to them occur in medieval Persian poetry. The cock was specially revered by Zoroastrians because its crowing heralds the day and drives away the demon-infested night. According to the Persian national epic, the Shahnamah ('Book of Kings') the bird was first domesticated by the mythical king Tahmurath, who ordered people to speak kindly to it.