About the year 1450 the Sforzi, the Lords of Pesaro, established at the latter place Maiolica factories, and a decree, dated 1st of April, 1486, was published, granting certain privileges to the ceramists of Pesaro. The potteries of Urbino, Gubbio, and Castel-Durante were then equally famous with those of Pesaro. It is generally thought that the use of metallic lustre was first known at Pesaro; the pearly, the ruby, and the golden lustres appeared at Pesaro and Gubbio before they were known at any other Italian pottery. The early pieces are decorative dishes, or, as they are called, “bacili,” having a broad border and a deep sunk centre; at the back is a projecting circular “giretto,” pierced with two holes, which shows that they were intended to be hung up as decorative objects. Coats of arms, or other devices, occupied the centre; the border usually is simple but well designed, showing a mixture of Oriental with Gothic or Italian forms (Fig. 15). The potteries of Faenza, Forli, and Caffaggiolo are thought by some to be as early, if not earlier, in date than those of Pesaro. [Illustration: Fig. 15.—Early Pesaro Dish. (S.K.M.)] In 1444 Federigo, the second Duke of Urbino, built a castellated palace at Urbino, and gathered around him men of learning and many artists, and especially encouraged the manufacture of maiolica. His son, Guidobaldi I., succeeded him in 1482, and he also was a great patron of the ceramic arts. The ware made in Italy during this time—the latter half of the fifteenth century—was known under the name of “mezza-maiolica,” this ware differing from tin-glazed or true maiolica in its glaze in its having a lead or plumbeous glaze; but in common with the true maiolica, the mezza-maiolica is also a lustred ware, having a peculiar iridescent lustre, derived from the lead used as a glaze. This lustred ware was therefore made anterior to the tin-glazed dishes and other objects, and chiefly at Pesaro and Gubbio. The lustre was obtained on a glaze of oxide of lead and glass by the use of certain metallic oxides, and the art of making it was probably learnt from the potters of the island of Majorca, where the making of the Hispano-Moresque ware was well known.